P0054 - HEATED OXYGEN SENSOR (HO2S), BANK 1, SENSOR 2 - HEATER RESISTANCE

DTC code P0054 OBDII is stored because the PCM (Powertrain Control Module) detects a resistance outside the established parameters in the Oxygen Sensor (O2), control circuit.

Although this code indicates a problem with the resistance, high or low resistance problems can occur in the wiring or even in the PCM. But most likely the cause of the failure is a problem with the internal resistance of the O2 sensor. Normally the resistance in this circuit is expected to be 8 ohms or close, if a variation of that value occurs, the Check Engine light will illuminate.

• MIL light on.
• Difficulty starting.
• Fuel efficiency decreases.
• Excessive black smoke expelled by the exhaust.

The error code P0054 OBD2 is set due to:

• There may be Oxygen Sensor cables or connectors in poor condition.
• The Oxygen Sensor may be defective.
• The link of a fuse or the fuse itself damaged.
• Motor control relay in bad condition.

To troubleshoot the diagnostic code P0054 OBDII you must do the following:

• Perform a visual inspection of the system cables. Pay attention to cables that are close to the exhaust pipe or other components that are hot and cause cable wear. Change the cables or connectors in bad condition.
• Use a digital multimeter to check all system fuses and their links. These tests must be carried out with the system loaded, since at that moment they fail. Replace any damaged fuse, delete the code.
• If the code returns, wait until the engine temperature is cold enough to allow the Oxygen Sensor heater to start working. Then, look at the O2 sensor heater element input data. The heater voltage should be equal to the battery voltage or as close to it as possible. If this is not the case, there is a resistance problem. That is why you should change the Oxygen Sensor.
• Replace the Oxygen Sensor.