OBD-II Trouble Codes: Meaning & Fixes

P0420 Powertrain The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly. Low B0001 Body The airbag module found a fault in the firing circuit for the driver's front airbag (stage 1). High C0035 Chassis The ABS module lost a valid signal from the driver-side front wheel speed sensor. Moderate P0101 Powertrain The MAF sensor's airflow reading doesn't match what the engine computer expects… Low P0113 Powertrain The intake air temperature signal is stuck at maximum voltage, which usually means an open… Low P0135 Powertrain The heater inside the upstream oxygen sensor on bank 1 isn't working or its circuit is faulty. Low

B0001 Body The airbag module found a fault in the firing circuit for the driver's front airbag (stage 1). High B0002 Body The airbag module sees a fault in the second-stage firing loop of the driver's steering wheel… High B0004 Body Fault in the firing circuit of the driver's knee airbag in the lower dash below the steering… High B0010 Body The airbag module found a fault in the first-stage firing loop of the front passenger's… High B0012 Body Airbag firing-loop fault; location depends on the make: passenger dash airbag or, on GM… High B0013 Body Fault in the firing loop of the front passenger's knee airbag near the glovebox; GM uses… High B0020 Body Fault in the firing loop of the left (driver-side) side airbag, usually the one in the driver's… High B0022 Body Fault in the second firing loop of the left roof-rail curtain airbag; GM and others use B0022… High B0028 Body Fault in the firing loop of the right (passenger-side) side airbag, usually in the passenger… High B0050 Body The airbag module can't reliably tell whether the driver's seatbelt is buckled. Moderate B0051 Body SAE: front middle seat buckle sensor fault. On GM vehicles: the airbag module has logged… High B0052 Body Usually a fault in the front passenger's buckle sensor; on GM vehicles it is a stored crash… Moderate B0057 Body SAE: third-row middle buckle sensor fault. GM: fault in the front passenger belt pretensioner… High B0074 Chevrolet · Body The pressure sensor mat inside the passenger seat cushion is giving bad or no readings. High B0081 Chevrolet · Body The airbag module reports a problem with the passenger presence module under the right front… High B00A0 Body The front passenger seat sensing system has failed, so the car can't tell who, if anyone… High B0111 Toyota · Body The airbag computer sees a break in the firing circuit of the right front seat's side airbag. High B1018 Nissan · Body The airbag unit reports a passenger seat occupant sensor fault, so the passenger airbag may be… High B1318 Ford · Body A Ford body or chassis module saw its supply voltage fall below roughly 10 volts while it was… Low B1325 Chevrolet · Body A GM body module saw its supply voltage drop too low or rise too high, usually a battery issue. Low B1342 Ford · Body A Ford module failed its own internal self-test. Which module stored it decides what gets fixed. Moderate B1346 Hyundai · Body The airbag computer measured too much resistance in the driver airbag circuit; it may not… High B1448 Hyundai · Body The sensor mat in the passenger seat cushion failed its self-test, so the passenger airbag… High B1650 Toyota · Body The airbag computer got an error from the passenger seat weight sensors and can't classify… Moderate B1676 Ford · Body The ABS or another Ford module saw its supply voltage go too low or too high, and it shut its… Moderate B1706 Hyundai · Body The airbag computer sees too much resistance in the passenger seat belt buckle pretensioner… Moderate B1764 Kia · Body Kia's passenger seat detection unit reports a broken sensor mat, so airbag suppression can't be… High B1801 Toyota · Body The airbag computer measured a break in the driver airbag's firing loop through the steering… High B1B02 Jeep · Body The airbag computer sees a break in the driver airbag's firing circuit, so it may not deploy… High B2278 Ford · Body The power steering module can't trust the column torque sensor, so it drops or limits steering… High