P1167 - FAULT CODE - OBD2

POST UPDATED IN February, 2023

P1167 Code failures by brands

P1167 ACURA, HONDA - RATIO SENSOR 1 HEATER SYSTEM MALFUNCTION

Description of DTC code P1167

The Air/Fuel Ratio Sensor continuously monitors the oxygen that is in the exhaust gases being expelled from the engine. This data is relayed to the PCM, which accordingly adjusts the air/fuel ratio to achieve better engine efficiency. The temperature of these sensors is increased when it is required to take readings as soon as possible.

The P1167 OBDII fault code is a manufacturer-specific code. For most cases, it has to do with a problem with the air/fuel mixture and Oxygen Sensors. For Honda and Acura manufacturers, it means that an Air/Fuel Ratio Sensor 1 heater system failure has occurred. If the heater does not activate, or if the PCM terminal voltage is not enough while drawing power from the heater, it will be interpreted as a malfunction.

Symptoms of fault code P1167

Causes of OBD2 P1167

Reasons for setting the P1167 OBD2 diagnostic code on Acura and Honda:

  • Possibly the wires of the Air/Fuel Ratio Sensor 1 are damaged.
  • The electrical connections of the A/F Sensor circuit may be erratic.
  • The Air/Fuel Ratio Sensor 1 may be faulty.

Possible solutions of the DTC code P1167

To solve the DTC P1167 OBDII code, take into account the following steps:

  • Consult the vehicle's information source to access the TSBs provided by the manufacturer.
  • Inspect all the wires that are connected to the A/F Sensor for damage due to high temperatures or chafing. Make any necessary repairs or replacements.
  • Verify that the electrical connections of the A/F Sensor circuit are correctly adjusted and that the voltages of these are adequate for the good performance of the circuit. Make corrections if necessary.
  • Consult the service manual for diagnostic steps for the Air/Fuel Ratio Sensor. If after performing these tests you determine that the sensor is bad, replace it.

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