CAR OBD CODES
OBD/DTC Search, e.g.P0420
CAR OBD CODES P0420
P0420 OBD Code Definition:
P0420 Catalyst System Efficiency Below Threshold Bank 1
P0420 OBD Code Description:
OBD2 Code P0421 Definition:
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 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.
Symptoms
Possible sumptoms of P0421
You will likely not notice any drivability problems, although there may be symptoms. The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days.
Possible Causes
Possible causes of P0421
A code P0421 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 A sparkplug is fouled up
Possible Solutions
Measure the voltage at the oxygen sensor on Bank 1 (the rear sensor, or the sensor after the converter). 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. OBD-II Codes
P0420 P0422 P0423 P0424 P0425 P0426 P0427 P0428 P0429
Note: The information on the P0420 error code is purely informative, if you need more useful information, please consult your technician.
B1B71 B3477 B2578 B107B B2486 B1006 B2793 B2804 B2270 B119D B2145 B1972 B0429 B1540 B1974 OBDII Chassis Codes
C0472 C1480 C1958 C0095 C1941 C2007 C0662 C2206 C2808 C1329 C1873 C1203 C1722 C1709 C2793 OBDII Network Codes
U1067 U0430 U3010 U1045 U1124 U0557 U059E U2606 U0444 U0494 U0223 U0555 U017A U1101 U1081 OBDII Powertrain Codes
P1918 P253B P2321 P171B P281E P06BB P1660 P181C P072F P0724 P1138 P2758 P0475 P1700 P0BF5