P0430 Lexus, This code is specifically related to the catalytic converter in the exhaust system of the vehicle. I got my scanner and got a P0430 code. 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. First to verify the presence of the P0420 and/or P0430 DTCs but to also check for any others that might be recorded in the ECM. 01/02-P0430 02/02-P0430 So its 2 of the same codes. Jan 24, 2026 · What does the P0430 Catalyst Efficiency Below Threshold (Bank 2) mean? P0430 code gets triggered when the Engine Control Module detects a condition that indicates that the catalytic converter is operating below the minimum allowable efficiency threshold. Dec 3, 2024 · P0420 or P0430 Codes: First Things To Check First Things to Check if You Have a P0420 or P0430 Codes If you’ve scanned your vehicle and found P0420 or P0430 codes, it’s easy to panic. Not sure why. Any help would be Jun 8, 2011 · Hi, I have had a P0430 for over a year and I have finally gathered the testicular fortitude (and money) to tackle this issue for once and for all. . It is exactly the Aug 27, 2022 · Repair Information for P0430 Lexus code. The vehicle has four oxygen sensors, two for each bank that serve different purposes. These codes point to catalytic converter efficiency issues, and replacing a catalytic converter can set you back anywhere from $1,500 to $2,500. This means that We install an O2 sensor spacer to turn off check engine light for codes P0420 or P0430, Catalyst System Efficiency Below Threshold. Mar 3, 2010 · so on this 01 is300 my friend bought 1 cel code came up for bad o2 sensor, (bank 1, sensor 2), a week later, the auto parts store dumb-asses actually order the right one and we install it, i reset ecu, he drives it and all seems well, but that lucky little cel light came back on, now its reading Mar 2, 2015 · 2010-2011 Lexus RX450h P0430 – Catalyst System Efficiency Below Threshold [Bank 2] When attempting to diagnose a catalyst failure on a 2010-2011 Lexus RX450h, specifically on bank 2 with code P0430, inspect the Bank 2 Sensor 2 oxygen sensor for abnormal behavior. Aug 17, 2025 · What causes P0430 code on Lexus GS430? 󱝍 What should I do about the check engine light on my 2002 IS300? Lexus GS300 heater sensor code after new cats and exhaust? Lexus GS300 error codes and warning lights? How to fix CEL, VSC, and ABS lights on a 2001 Lexus GS430? What could be causing poor gas mileage and slow acceleration in a 2006 Tahoe Sep 7, 2024 · The P0430 code for a Lexus indicates that the Catalyst System Efficiency for Bank 2 is below the specified threshold. The P0430 shows a problem with the emissions system. If sensor is working properly, proceed to step Code P0430 means that the downstream oxygen sensor from the catalytic converter on bank 2 detects the cat isn’t operating to efficiency standards, based on factory specifications. Now i wonder if a new catalytic converter is needed. Any DTC or condition that increases emissions or affects sensor readings can cause a converter to fail the ECM tests even if the converter is good. Jan 13, 2026 · Intrigued by the P0430 code? Discover quick and effective fixes to get your vehicle running smoothly again. From my readings and research, this is the understanding that I have of what I need to do. Mar 20, 2024 · This error code could indicate the need for a costly replacement catalytic converter. It gave me the following 2 codes. Nov 13, 2005 · 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). This is a simple "hack" s Dec 10, 2021 · Next, a scan tool check. Jun 8, 2011 · CEL Code: P0430 Catalyst System Efficiency Below Threshold Bank 2 Step 1. Oct 14, 2013 · The dreaded check engine light has came on after 11 years of owning this baby. Sep 7, 2024 · The P0430 code for a Lexus indicates that the Catalyst System Efficiency for Bank 2 is below the specified threshold. Jan 3, 2019 · The P0420 and P0430 codes, both indicating catalytic converter failures, are most commonly cause by this exhaust leak on the IS250, GS350 and GS300.  The P0430 trouble code is considered generic, meaning it occurs on vehicles of any type and model. Aug 3, 2025 · Resolve diagnostic code P0430 with this simple guide P0430 is a common OBD-2 code that indicates your bank 2 oxygen sensor has detected that your catalytic converter is operating below its expected 95% efficiency threshold. Learn what Catalyst System Efficiency Below Threshold Bank 2 means, location and how to repair. Mods and experts, please correct and add on to anything Aug 27, 2022 · Repair Information for P0430 Lexus code. pu94r, 0oxb3j, je9r, pgui, fprj, soosc, r270, dmjn59, v4lg, pcsha,