P0143

02 Sensor Circuit Low Voltage (Bank 1 Sensor 3)

DTC P0143, sometimes indicated as P014300 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the air/fuel mixture causing 02 sensor circuit low voltage (bank 1 sensor 3).

The most likely cause of this code is a bad oxygen sensor. Other causes could include a leak in the exhaust system, a problem with the fuel injection system, or a problem with the engine computer.
If the code is caused by a bad oxygen sensor, it will need to be replaced. If the code is caused by a problem with the fuel injection system or the engine computer, the problem will need to be diagnosed and fixed.

  • P0143: 02 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
  • P0143: O2 Sensor Circuit Low Voltage Bank 1 Sensor 3
  • P0143: O2 Sensor Circuit Low Volts (Bank 1 Sensor 3)
  • P0143: O2 Sensor Circuit Low Voltage
  • P0143: Heated oxygen sensor (HO2S) 3, bank 1 – low voltage
  • P0143: Oxygen sensor (O2S) 3, bank 1 – low voltage
  • P0143 00: Probe signal? 3 too low
  • P0143 00: Heated oxygen sensor (HO2S) 3, bank 1 - low voltage
  • P0143 00: Oxygen sensor (O2S) 3, bank 1 - low voltage

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Bulletins

Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.

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