P0430 lexus gs300

Code P0430 Tech Notes. As the code description implies the P0430 code means that the vehicle's Engine Control Module (ECM) has detected that the Three-way Catalyst Converter is not working properly (it is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the Three-way ...

P0430 lexus gs300. We finally made it in and their (Lexus dealership) diagnostics read a "P0420 and P0430 failure with AF sensors, O2 sensors, and catalyst system efficiency below threshold (Bank 1) (Bank 2)". They, of course, recommended replacing all sensors and convertors at an estimated cost of $3869.13 - before labor and tax!

What is the Cost to Diagnose the Code P0420 Lexus? Labor: 1.0. The cost to diagnose the P0420 Lexus code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

My wife's coworker is selling her 2002 Lexus ES300 with 130K miles for $4K. It is garage kept, new tires, and well maintained. The coworker's husband used to be a service technician at a Lexus dealership, so he has been keeping it in good shape. I currently drive a 2002 Toyota Camry with 190K miles on it. It isn't the prettiest car and has some ...The code reads P0430 and have changed sensor before and light came back on. What's the next step? Which after market parts would you recommend to use or to stay away from? ... 06 - 12 Lexus GS300 / GS350 / GS460 ; Check engine code: P0430 what now? Theme . IPB 4.6 (Default) IPB 4.6.1 Theme .P0430 Code: Catalyst System Efficiency Below Threshold (Bank 2) P20EE Code: SCR NOx Catalyst Efficiency Below Threshold (Bank 1) P2098 Code: Post Catalyst Fuel Trim System Too Lean (Bank 2) P0173 Code: Fuel Trim Bank 2. File Under : OBD-II Trouble Codes Tagged With : catalytic-converter. Subscribe. Notify of {} [+] {} [+] 40 …Codes P0441 & P0446. By reigns7703. April 13, 2007 in 93 - 05 Lexus GS300 / GS400 / GS430. Followers. Reply to this topic. Start new topic.This will be a multi part series on getting rid of the check engine light codes on my 1999 Lexus ES300. This first video addresses P1300 and P0301 for Cylin...Sep 21, 2011 · 1)The codes P0430 and p0420 indicate your catalytic converter efficeniency is reduced. This would lead one to believe. that the catalytic converter needs to be replaced which can be a major expense since your ls430 has. three catalytic converters. (two forward and one rear) . With a little investigation I found that. Hi, This fault code (P0430 Catalyst System Efficiency Below Threshold Bank 2) has been coming up on my 2004 GS300 for nearly 6 Months / 8 thousand miles. I'm getting consistently good mpg (27-30) and the car went through its MOT after the code first came up, obviously passing its emissions part of the test. Sometimes I can go 1500 miles between ...

Jan 5, 2010 · Bought a used 2006 GS300 about 4 months ago. After about 1 month, the check engine light came on in addition to the Check VSC message. Took it to the Lexus dealer, and they replaced the gas cap (multiple posts in this forum about the gas cap issue). After a week or so, check engine/VSC came back ... Lexus is one of the most well-known luxury car brands in the world. But what many people don’t know is that Lexus is actually made by Toyota, one of the largest and most successful automakers in the world. Here’s everything you need to know...Nov 11, 2018 · The P0430 check engine light code, like P0420, means the catalyst system efficiency is below the required threshold. Simply put, this means your car is addin... How to Troubleshoot Toyota C1201 Code? You must use three related codes to erase the C1201 code. They are as follows: The P0455 (Evaporator Emission Control leak detected, a big leak or no purge flow), and P0441 (Evaporator Emission control system incorrect purge flow and C1201 Engine control system Malfunction).Sep 21, 2011 · Took vehicle (GS 430 2006) to local muffler pipe this morning (September 2014) They put it up on the rack and cut the two spots that were leaking out and welded in new pipe. Total time for repair 45 minutes. Are you looking for a Lexus dealership near you? Whether you’re in the market for a new or used Lexus, it’s important to find the right dealership that can provide you with the best service and selection. Fortunately, finding a Lexus dealer...

Wide-ranging upgrades have strengthened the appeal of the Lexus UX 300e, the urban crossover launched three years ago as Lexus’s first all-electric model. These revisions enable the UX 300e to go further between charges; raise the cabin’s aesthetic appeal, comfort, and convenience; and make the car – Lexus’s “Creative Urban Explorer ...Does Cataclean really fix a P0420 / P0430 error code and catalytic converter. Cataclean Link: https://amzn.to/33t8RVQ Second channel for easy to follow Home ...2002 Lexus GS300 175K Miles Symptoms: (1) terrible gas mileage and (2) check engine light - pulled codes p0420 and p0430 I used a scantool application to pull the codes and monitored the OS 2 sensors' … read moreMatched by OEM manufacturer color names, our Lexus color chart offers close color matches to your vehicle’s current leather. While the hues may vary depending on your computer screen or mobile device, this chart can be used as a tool to help you pin down the right Lexus leather dye color. If you’re still having trouble finding your desired ...We finally made it in and their (Lexus dealership) diagnostics read a "P0420 and P0430 failure with AF sensors, O2 sensors, and catalyst system efficiency below threshold (Bank 1) (Bank 2)". They, of course, recommended replacing all sensors and convertors at an estimated cost of $3869.13 - before labor and tax!

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Codes P0441 & P0446. By reigns7703. April 13, 2007 in 93 - 05 Lexus GS300 / GS400 / GS430. Followers. Reply to this topic. Start new topic.Step 1. Check 02 Sensors How To Check 02 Sensor Can someone estimate how much a mechanic would charge to check the sensors? If 02 sensor is malfunctioning, replace for roughly $100 each (OEM) or search for universal aftermarket ones. If sensor is working properly, proceed to step two. Step 2. Check for exhaust leaks.Are you in the market for a new Lexus? If so, you’re likely looking for the nearest Lexus dealership to you. Fortunately, finding the closest Lexus dealership is a simple process that can be completed in just a few steps.Replacing the catalytic convertors, and exhaust system on the Lexus IS250 and IS350 requires removing the oxygen sensors. Normally taking out these sensors r...

2000 lexus gs 300 in wilmington,nc,had code p430,replaced cat converters that are built into the headers. ordered from lexus dealer in california.replaced all four o2 sensors. trouble cleared for 6 mo …Ok, the rear ones are different. For B1S2, the Lexus OE part number is:(NNN) NNN-NNNN Most local parts stores can "interchange" this OE number to the correct version of the after market part in which they carry. Keep in mind, you'll need a "better quality" sensor to meet Lexus specs. Those "universal" sensors will NOT solve the problem.Labor: 1.0. The cost to diagnose the P0121 Lexus code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour. What does this mean? Code P0430 Lexus Tech Notes As the code description implies the P0430 code means that the vehicle's Engine Control Module (ECM) has detected that the Three-way Catalyst Converter is not working properly (it is not as efficient as the factory is expecting).An example of a product line extension is the Toyota Lexus brand, which is a high-end extension of the basic Toyota brand that targets consumers looking for bargains. Diet Coke is a product extension of Coke, introduced to meet the need for...The Lexus is an automobile that is produced by Toyota. The Lexus LS 400 and the ES 250 debuted in 1989 as the first in a series of Toyota luxury vehicles. Following its entry into the U.S.This product is made with Jet fuel, a high quality carrier of active ingredients. This product is safe for all gasoline engines. STP Gas Treatment Used Regularly Helps: Boost cleaning performance of gas. Save gas by keeping fuel intake system clean. Fight fuel line freeze by removing water.How to Fix the P0300 Code. Disclaimer: Due to the wide variability in vehicle makes and models, as well as other factors, the following information must not be construed as complete or the only definitive way to address a particular issue.Instead, the following content merely attempts to give you a better idea of what a do-it-yourself approach to the …Jan 31, 2011 · Latest Posts; Home ; Forums ; Lexus Owners Club - Lexus Forums ; Lexus ES250 / ES300 / ES330 / ES350 / ES300h Club ; 92 - 06 Lexus ES250/300/330 ; Got Scan Code Of P0456 And Replaced The Gas Tankccap - What Next ?

Ok, the rear ones are different. For B1S2, the Lexus OE part number is:(NNN) NNN-NNNN Most local parts stores can "interchange" this OE number to the correct version of the after market part in which they carry. Keep in mind, you'll need a "better quality" sensor to meet Lexus specs. Those "universal" sensors will NOT solve the problem.

Cars & Trucks. Lexus. GS 430. 2001 Lexus Gs 430. Code p0430 on lexus... Share on Facebook. Share on Twitter. Share on Pinterest. Share by Email.Address: Jl. Kertajaya Indah Timur XIV/12 Blok P-460 Gebang Putih, Sukolilo Kota Surabaya, East Java, 60117 IndonesiaThis page is meant to help you troubleshoot the Lexus IS 300 P0420 trouble code. It covers the P0420 code’s meaning, symptoms, causes, and possible solutions. ... The bank 2 version of this code is P0430. Lexus IS 300 P0420 Code Symptoms. The P0420 code in a Lexus IS 300 will often be thrown if one of your car’s oxygen sensors is not …1999 Lexus GS300. Asked by kazoom99 in Riverview, FL on . May 19, 2010. have 99 lexus gs 300 check engin light on has bad cat converter which one is a bank 2? there is two of them bolted on engine block or one looks like mufler right on center of the car thanks . 1 reply Report. Answer.I have code p0302 and p0420 p0430 on my Lexus is300. There seems to be a leak from the head gasket building uP along the line of it and check engine light is on. ... 2002 Lexus GS300 175K Miles Symptoms: (1) terrible gas mileage and (2) check engine light - pulled codes p0420 and p0430 I used a scantool application to pull the codes and …1999 Lexus GS300 3.0L Installed both front and rear O2 sensors for bank 1, front O2 pattern was very erratic, would go high and low for extended period then back to normal,rear mimmicked front fairly close. Vehicle with 151K. Informed customer still possiblity of bad Catalyst.Missfire cyl 1 An 4. Replace the coil pack. Troubleshooting codes p0300, p0301, p0302, p0303,p0305. VSC light, VSC off light, check engine light and engine shaking. you have multiple cylinder missfire 1,2,3,5 check your spark plugs, plug wires and coils could even be a o2 sensor.Latest Posts; Home ; Forums ; Lexus Owners Club - Lexus Forums ; Lexus LS400 / LS430 / LS460 / LS500h / LS600h Club ; 90 - 00 Lexus LS400 ; Catalyst System Efficiency Below Threshold (bank 2good evening lexus owners, Lexus Gs430. [90500mi] - clean title - clean carfax. my check engine light is on and the Yellow indicator with exclamation mark also on (Brake System Warning Light (yellow) and the TRAC light is also on (suggesting that traction is OFF) --> all 3 of these are related to the code: P0430What does this mean? Code P0430 Lexus Tech Notes As the code description implies the P0430 code means that the vehicle's Engine Control Module (ECM) has detected that the Three-way Catalyst Converter is not working properly (it is not as efficient as the factory is expecting).

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The Lexus is an automobile that is produced by Toyota. The Lexus LS 400 and the ES 250 debuted in 1989 as the first in a series of Toyota luxury vehicles. Following its entry into the U.S.=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P2241 Saving Repair Parts...I have a 2002 Lexus IS300 with this curse of a code that never goes away. My car was randomly selected for a smog lab inspection by the DMV in order to reinstate my registration, however i have a CEL that keeps recurring P0420 (Catalytic converter efficiency below threshold BANK 1) So far ive done the following to attempt the fix:-replaced pre …kponti said: Sounds more like a catalytic problem than a sensor problem. The code reads: P0430- Catalyst System Efficiency Below Threshold (Bank 2) Using a simulator will do the job of removing the cel, but I bet your car will eventually (if not already) run a little like crap (just sometimes).Mar 17, 2019 · The most common fix for P0430 in the Lexus IS 300 is a new catalytic converter, followed by replacing the Oxygen sensor. Before taking your IS 300 into an exhaust shop for a new catalytic converter, let’s ensure that’s what you need. Here’s a good P0430 diagnostic order for the Lexus IS 300: 1. Check for Other Codes. May 27, 2021 · For More Info visit us at: http://1aau.to/h/cvP/Is your Check Engine Light on? The trouble code P0430 suggests there might be a problem with your catalytic c... GS - 2nd Gen (1998-2005) - Check Engine code P0430, Mechanic says need new cat - I have a 2003 GS300 with 160K miles. Check engine, VSC, VSC OFF lights came on this past weekend. I went to my mechanic yesterday and he said his computer is showing code P0430 which he says its for the catalytic converter and ill need to...About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...FYI this code is identical to P0430 however that code is for bank 2. You may even find you have both P0420 and P0430 trouble codes at the same time. ... I just had a check engine and VSC light come up on my 98 Lexus GS300 yesterday. So i took it to autozone to get them to tell me what was causing it. once the Autozone tech hooked the …GS - 2nd Gen (1998-2005) - Check Engine code P0430, Mechanic says need new cat - I have a 2003 GS300 with 160K miles. Check engine, VSC, VSC OFF lights came on this past weekend. I went to my mechanic yesterday and he said his computer is showing code P0430 which he says its for the catalytic converter and ill need to...Jan 31, 2011 · Latest Posts; Home ; Forums ; Lexus Owners Club - Lexus Forums ; Lexus ES250 / ES300 / ES330 / ES350 / ES300h Club ; 92 - 06 Lexus ES250/300/330 ; Got Scan Code Of P0456 And Replaced The Gas Tankccap - What Next ? ….

I HAVE A 06 LEXUS GX470 SETING P0420 AND P0430 SIMULTAINEOUSLY REPLACED REAR CATS AND CODES STILL COME UP IMMEADIATLY - Answered by a verified Lexus Mechanic. ... 2006 Lexus gs300 RWD.Originally had code p0430 for bamk 2 catalytic converter. So i removed the header …Cars & Trucks. Lexus. GS 430. 2001 Lexus Gs 430. Code p0430 on lexus... Share on Facebook. Share on Twitter. Share on Pinterest. Share by Email.Location: Texas (TX) Posted June 1, 2010. I just replaced my converters on my 97 LS400... then I saw this: "I have found out that the P0420 and P0430 codes typically have to do with a catalytic converter gasket leak. I had the P0430 code and made the mistake of taking it to the dealer. Of course, I was told to replace them both for $2,600 plus tax.Are you looking for a Lexus dealership near you? Whether you’re in the market for a new or used Lexus, it’s important to find the right dealership that can provide you with the best service and selection. Fortunately, finding a Lexus dealer...Feb 23, 2022 · Lift the hood and the front bank, right hand plug is the one. Remove the vanity cover, remove the coil pack, unscrew the plug. Look at the Scotty Kilmer YouTube channel.. He was doing one the other day, search 'Lexus spark plugs'. 08-25-05 08:30 AM. Tags. p0420, p0430. GS - 3rd Gen (2006-2011) - GS300 cat problem - Hi, dear Lexus users, I am facing down by P0430 code. I am aware of possibile causes : - Gas leaks from exhaust system - Air fuel ratio sensor (sensor 1) - Heated oxygen sensor (sensor 2) - Front exhaust pipe assembly (TWC: Front and rear catalyst) - EGR valve ...Are you in the market for a new Lexus? If so, you’re likely looking for the nearest Lexus dealership to you. Fortunately, finding the closest Lexus dealership is a simple process that can be completed in just a few steps.January 4, 2023 by Jason This page is meant to help you troubleshoot the Lexus IS 300 P0430 trouble code. It covers the P0430 code's meaning, symptoms, causes, and possible solutions. P0430 is an emissions-related trouble code and is virtually never a breakdown risk. P0430 is usually caused by a catalytic converter issue or a bad O2 sensor.Sep 17, 2010 · Lexus Owners Club - Lexus Forums ; Lexus GS300 / GS350 / GS400 / GS450h / GS430 / GS460 Club ; 93 - 05 Lexus GS300 / GS400 / GS430 ; Cel P0430 Cel P0430. By ganny P0430 lexus gs300, I own a 2002 Lexus es300 and I got a P0430 code. On 02/01/20 I had the bank 2 catalytic converter replaced which is essentially the exhaust manifold. 100 miles later, the same code came back., The Variable Valve Timing (VVT) system controls intake valve timing in response to driving conditions. Possible causes are: Incorrect valve timing P1346, P1349, P1351 & P1354. Faulty oil control valve P1346, P1349, P1351 & P1354. Faulty VVT controller assembly P1346, P1349, P1351 & P1354. Faulty ECM All Codes., I have a 2002 Lexus IS300 with this curse of a code that never goes away. My car was randomly selected for a smog lab inspection by the DMV in order to reinstate my registration, however i have a CEL that keeps recurring P0420 (Catalytic converter efficiency below threshold BANK 1) So far ive done the following to attempt the fix:-replaced pre …, Jul 25, 2007 · Failed Emissions test with following 3 codes; P0420, P0430, P0446. P0420 and P0430 are Bank #1 and Bank #2 Catalytic are both below standard efficency. P0446 says the EVAP Carbon Canister is malfunctioning. Got qoute from Lexus for bank 1&2 Cat replacement $1725, for Carbon canister $585. Reset codes by battery disconnect. CEL back on in 80 miles. , Labor: 1.0. To diagnose the P0121 Lexus code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour., Most people replace parts that are not needed...AMAZING. This code is ALMOST ALWAYS this issue. 99% of the time I've found out.Check out My Amazon Auto Acces..., Most people replace parts that are not needed...AMAZING. This code is ALMOST ALWAYS this issue. 99% of the time I've found out.Check out My Amazon Auto Acces..., 2002 Lexus GS300 175K Miles Symptoms: (1) terrible gas mileage and (2) check engine light - pulled codes p0420 and p0430 I used a scantool application to pull the codes and monitored the OS 2 sensors' …, PO430 - Bank 2 catalyst below threshold. PO500 - Vehicle Speed Sensor Circuit Malfunction. C1201 - Engine Control System Malfunction or ECM / TCM Malfunction. C1241 - Low Battery Positive Voltage. I begin to think that all codes are related and causing my startup issue., Lexus is one of the most well-known luxury car brands in the world. But what many people don’t know is that Lexus is actually made by Toyota, one of the largest and most successful automakers in the world. Here’s everything you need to know..., Jan 31, 2011 · Latest Posts; Home ; Forums ; Lexus Owners Club - Lexus Forums ; Lexus ES250 / ES300 / ES330 / ES350 / ES300h Club ; 92 - 06 Lexus ES250/300/330 ; Got Scan Code Of P0456 And Replaced The Gas Tankccap - What Next ? , The most common P0420 and P0430 cause is a clogged catalytic converter filter, which requires replacing the entire catalytic converter. Other causes can include: A faulty or failing o2 sensor. Catalytic converter leaks. Exhaust , intake, or mass airflow (MAF) sensor leaks or other issues., My 06 GS 300 has the check engine light on. The code reads P0430 and have changed sensor before and light came back on. What's the next step? Which after …, My wife's coworker is selling her 2002 Lexus ES300 with 130K miles for $4K. It is garage kept, new tires, and well maintained. The coworker's husband used to be a service technician at a Lexus dealership, so he has been keeping it in good shape. I currently drive a 2002 Toyota Camry with 190K miles on it. It isn't the prettiest car and has some ..., =====Claim your FREE error code eraser 👉 https://free.nonda.co 👈== How to Fix P0430 Error Code ====Error Code P0430 Saving Repair ..., =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P2241 Saving Repair Parts..., What is the Cost to Diagnose the Code P0420 Lexus? Labor: 1.0. The cost to diagnose the P0420 Lexus code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour., In Abilene TX, the codes were P0128, P0430 and P0420. Finally got it to a Lexus dealer in El Paso, who reported codes P0128 and P0420. ... I have a 2001 GS300 Lexus with 118,000 miles, my check engine light came on about a month ago, when I had it checked they indicated that there was a problem with the catalytic system. ..., =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P2241 Saving Repair Parts..., Hey guys, few weeks ago I bought 2003 Lexus es300 with 200k mileage. It came with check engine light for bank 2. ... P0430 (cat bank2) on Lexus ES300 . Hey guys, few weeks ago I bought 2003 Lexus es300 with 200k mileage. It came with check engine light for bank 2. Went to the mechanic and did the inspection. Everything is great with the car, perfect …, =====Claim your FREE error code eraser 👉 https://free.nonda.co 👈== How to Fix P0430 Error Code ====Error Code P0430 Saving Repair ..., J. jasonm4. 18192 posts · Joined 2009. #14 · Jul 24, 2012. bwsteg said: P0430 is bank 2 and the oxygen sensor is located under the passenger seat at the y pipe. P0430 means catalytic convertor is below threshhold and can result of a cat issue, exhaust leak, or bad B2S2 (sounds like you changed B1S2)., The code reads P0430 and have changed sensor before and light came back on. What's the next step? Which after market parts would you recommend to use or to stay away from? 5 months later... CowBoE Regular Member 11 First Name:CowBoE Lexus Model: GS300 Year: 2006 Location: Texas (TX) Posted December 31, 2020, Step 3 - Take an OBD-II reading. If the Lexus has been misfiring for long enough, it will have probably thrown a check engine light. The light means the Lexus has a diagnostic trouble code stored on its ECU. An easy way to retrieve those codes is by using an OBD-II scanner., Lexus gs 300: I have a 2006 lexus gs 300 AWD that is getting I have a 2006 lexus gs 300 AWD that is getting a P0430 code. I replaced the Bank 2 sensor 2 Oxygen sensor already but 6 weeks later it's giving the same code. …, 1999 Lexus GS300 3.0L Installed both front and rear O2 sensors for bank 1, front O2 pattern was very erratic, would go high and low for extended period then back to normal,rear mimmicked front fairly close. ... It was ok for about year or so now I have same intermitten P0430 and P0420 but I have to use scan tool to reset that code and it will ..., Are you looking for the best price on Lexus parts? Whether you’re a DIY enthusiast or a professional mechanic, finding the right parts at the right price can be a challenge. Fortunately, there are several ways to get the best price on Lexus..., What is the Cost to Diagnose the Code P0420 Lexus? Labor: 1.0. The cost to diagnose the P0420 Lexus code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour., Lexus Model: GS300 Year of Lexus: 2002 Location: Norfolk Posted January 30, 2017 Hi gang, A little advice please. I have code P0430 Catalyst Working Below Efficiency Bank 2. Can anything be done i.e Italian tune up, or is a new Cat required? Thanks, Bod Quote AmbroseJohn Established Member 441 Name: John Lexus Model: GS450h Year of Lexus: 2008, 25,658 satisfied customers. Lexus 2002: 2002 Lexus GS300 175K Miles Symptoms: (1) 2002 Lexus GS300 175K Miles Symptoms: (1) terrible gas mileage and (2) check engine light - pulled codes p0420 and p0430 I used a … read more., Aug 31, 2022 · To diagnose the P0456 Lexus code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour. , GS - 2nd Gen (1998-2005) - Check Engine code P0430, Mechanic says need new cat - I have a 2003 GS300 with 160K miles. Check engine, VSC, VSC OFF lights came on this past weekend. I went to my mechanic yesterday and he said his computer is showing code P0430 which he says its for the catalytic converter and ill need to..., 93 - 05 Lexus GS300 / GS400 / GS430 ; Gs430 p0420 and p0430 Gs430 p0420 and p0430. By muayad925 July 23, 2016 in 93 - 05 Lexus GS300 / GS400 / GS430 ... Im getting codes p0420 and p0430 and i took it to a exhaust shop to check for leaks but they didnt find anything. Althought, i didnt think they checked under the heat shields. The …