P0430 Catalyst System Efficiency Below Threshold (Bank 2)
Catalyst System Efficiency Below Threshold (Bank 2)
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.
A code P0430 may mean that one or more of the following has happened:
- The catalytic converter is no longer functioning properly
- An oxygen sensor is not reading (functioning) properly
- There is an exhaust leak
First, inspect for exhaust leaks.
Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
Related P0430 DTC Discussions
- `97 Taurus with DTC P0133, P0420, & P0430
I have a`97 Taurus GL with the standard 3.0 V6, auto with 114k miles. My wife's car. Bought it new, getting the CEL on most of the time. Sometimes when starting the car it will surge or stumble and die. This is very infrequent but is part of the problem. The ISC was replaced for the surge/ stumble p...
- P0420, P0430, p1351
I have read the article on this topic. I drive a 97 Chevy Silverado, 2WD 5.7L 205k miles. I replaced the coolant temp sensor, and checked O2 sensors. Bank 2(P0430) had a bad sensor. I replaced and all other sensored read within specs. Reset codes and they came back. I find it hard to believe both ca...
- reduced power 2008 chev avalanche p0420, p0430,p0106, p069e, p1682, c0035, c0561, c0899,c0900, and p0573
Having some check engine light issues and after reading about this on various sites it sounds like it can get costly and tricky.. There is a tsb where the throttle body sensor is replaced under warranty if under 120k miles....I think the it is sensor and or electrical related. I bought the truck new...
- 1998 Ford Windstar 3.0/ Codes P0430 AND 1744
MY VAN WON'T SHIFT OUT AFTER I START DRIVING. NO WARNING SIGN JUST HAPPENED ALL OF A SUDDEN. CODES READ 1744 ANE p0430. WHAT SHOULD I DO. I JUST LEFT IT PARKED INSTEAD OF TRYING TO DRIVE IT BACK HOME. PLEASE HELP IT GOES INTO DRIVE, REVERSE, AND PARK JUST FINE...
- p0101 p0107 p0430 p0420 1996 camaro 6 speed lt1
just put new motor in my 96 camaro LT1 and i keep getting these codes no matter what i do p0101 p0107 p0430 p0420. i have replaced the mass air flow sensor, idle air control, throttle positioning sensor, plugs. Cant think of what else could cause this problem. any suggestions would be greatly appre...
- 00 Silverado 1500 P0430 code
I failed emission test and the reason was my CEL light wads on and it registered code P0430 (Catalyst system below threshold bank 2). I was going to replace both converters, but after reviewing this forum I am worried It might just be an o2 sensor. The truck idles a little rough and is getting bad g...
- P0430 gmc suburban 1998
[b:3muabd3c]Hello all, I just replaced a exhaust pipe,muffler, and intermediate pipes on my suburban. put a new o2 sensor(1) into the intermediate pipes i now get this P0430 code. any ideas why it would show this code after replacing these four items? thank you for this great site[/b:3muabd3c]...
- Code P0430
2001 Ford Escape XLT V6. Code P0430. I know this code refers to the converter on bank 2. My question is the engine runs great even when the engine light comes on. I had an issue with cold start rough idle, but now it's fine. There is no power loss issue, no acceleration issue, no stalling issue. It ...
- 1999 Chevrolet Suburban P0430
I have a 1999 Chevrolet Suburban with 124000 miles. Recently, it began reporting a P0430 error code. After clearing the code several times, it returns. After reviewing the online article regarding this subject, I checked for exhaust leaks and found none. I checked the voltages of the sensors with a ...
- Help.... OSD-II codes are set P0430, P0171, P0174
I have Mercury 1997 Cougar. OSD-II codes are set P0430, P0171, P0174. Engine cool short term fuel trim getting 35%, and long term fuel trim getting 7%. Engine warm short term fuel trim getting +5%, -5% and long term fuel trim getting 7%. Symptoms; The engine stall immediately after start. ...
Need more help with a p0430 code?
If you still need help regarding the P0430 trouble code, please post your question in our FREE car repair forums.
NOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected. If you want to share this article or information with others, please link to this page, don't copy and paste it elsewhere.