The P0063 trouble code is linked to the HO2S (Heated Oxygen Sensor) Heater Control Circuit Low in Bank 2, Sensor 3. This code indicates a low voltage condition in the control circuit of the heater in the third oxygen sensor of Bank 2. It’s commonly found in vehicles equipped with oxygen sensors to monitor the air-fuel mixture.
P0063 HO2S Heater Control Circuit Low (Bank 2 Sensor 3)
Code symptoms P0063.
1. Illuminated “Check Engine” or “Service Engine Soon” light on the dashboard.
2. Decreased fuel efficiency.
3. Engine performance issues.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0063.
1. Low voltage condition in the control circuit of the heater in the third oxygen sensor of Bank 2.
2. Wiring issues in the oxygen sensor circuit.
3. Faulty Powertrain Control Module (PCM).
Code Solutions P0063.
1. Inspect and replace the third oxygen sensor in Bank 2 if affected by low voltage.
2. Inspect wiring in the oxygen sensor circuit and repair or replace damaged sections.
3. If other causes are ruled out, diagnose and replace the Powertrain Control Module.