Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1994 Buick Roadmaster BaseFACTORY OEM SERVICE PROCEDURE
Code 63, Open Right Heated Oxygen Sensor Circuit: Notes
NOTE:
Engine is equipped with 2 oxygen sensors. On this model, code will set if the right sensor circuit is open. Code 13 will set if the left sensor circuit is open. Oxygen sensors use a heating element. Heating element is not controlled by PCM.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.