This should help you:
http://www.obd-codes.com/trouble_codes/
SOURCE: Hi i get codes P0431 and P0174 on a 2002 Kia
I have tried everything, but I am coming to the conclusion that I have a bad pcv letting in too much air. The concensus of how to fix it seems to be to clean the MAF with some electical cleaner or brake cleaner. Basically, you are getting too much air into the throttle body after the MAF or a dirty MAF.
SOURCE: check engine light does not work and i have 3
when you first turn the ignition key on all the working lights will come,if its not working could be a bulb in the dash.if its working maybe the codes are old and stored in there because no one erased them.
SOURCE: What are codes P1492, P0421 & P0431 on the
po421 warm up catalyst efficiency below threshhold bank 1, 431 same on bank 2..
SOURCE: My 2004 Kia Sedona's engine
P0325 Knock sensor (KS) 1 , bank 1 - circuit malfunction P0431 Warm up catalytic converter, bank 2 - efficiency below threshold
Possible causes: Wiring, poor connection, KS
knock sensor malfunction may reduce fuel mileage due to computer reducing ignition timing advance.
To repair: Check connector on knock sensor. If connection is good, replace sensor.
Possible causes: Catalytic converter, wiring, HO2S 2
increased HC emissions--no effect on engine performance unless caused by rich mixture.
To repair: Usually caused by worn out converter, but first verify fuel pressure regulator is not leaking fuel into it's vacuum port and that fuel pressure at the fuel rail is not above specification.
The car will run fine and there are no safety issues; however, before driving over anything that could ignite (for example, grass), make sure the catalytic converter is not glowing red.
If you have more questions, please let me know.
P0431 Warm up catalytic converter, bank 2 - efficiency below threshold
Possible causes: Catalytic converter, wiring, HO2S 2
increased HC emissions--no effect on engine performance unless caused by rich mixture.
To repair: Usually caused by worn out converter, but first verify fuel pressure regulator is not leaking fuel into it's vacuum port and that fuel pressure at the fuel rail is not above specification.
The car will run fine and there are no safety issues; however, before driving over anything that could ignite (for example, grass), make sure the catalytic converter is not glowing red.
If you have more questions, please let me know.
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