Mazda OBD Codes: Meaning & Fixes

P0171 Powertrain The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees… Moderate P1000 Ford · Powertrain Ford's computer hasn't finished all its self-tests yet. It's a status message, not a fault. Minor P0455 Powertrain The fuel vapor system can't hold vacuum at all — check the gas cap first, then hoses and valves. Low

B00A0 Body The front passenger seat sensing system has failed, so the car can't tell who, if anyone… High B2278 Ford · Body The power steering module can't trust the column torque sensor, so it drops or limits steering… High C0020 Chassis The ABS module saw a fault in the electric pump motor that builds brake pressure during ABS… Moderate P0016 Powertrain The bank 1 intake cam and the crankshaft are out of step, most often from a stretched or jumped… High P0126 Powertrain The engine didn't reach, or couldn't hold, the coolant temperature the ECU needs for stable… Low P0171 Powertrain The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees… Moderate P0192 Powertrain The rail pressure sensor signal voltage has fallen below the lowest value a working sensor can… Moderate P0400 Powertrain EGR flow doesn't match what the ECU expected, and the code doesn't say whether it's too much… Low P0455 Powertrain The fuel vapor system can't hold vacuum at all — check the gas cap first, then hoses and valves. Low P0720 Powertrain Electrical fault in the output shaft speed signal – shift timing and sometimes the speedometer… Moderate P0780 Powertrain A gear change didn't complete the way the TCM expected, but it can't pin the fault to one part. Moderate P1000 Ford · Powertrain Ford's computer hasn't finished all its self-tests yet. It's a status message, not a fault. Minor P2004 Powertrain The intake runner or tumble flaps stay open when told to close, usually a vacuum or linkage… Low P2009 Powertrain The runner or tumble flap solenoid circuit reads too low: a short to ground, an open coil… Low U0101 Network The engine computer and other modules stopped hearing from the transmission control module. High U0140 Network Other modules stopped hearing from the body control module that runs lights, locks, wipers… Moderate U3003 Network A control module saw its supply voltage drop too low or rise too high, usually a battery… Low