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.
1993 Pontiac Firebird Formula, AutomaticFACTORY OEM SERVICE PROCEDURE
Code 13 - Open Oxygen Sensor Circuit: Notes
NOTE:
The 5.7L (VIN P) engine is equipped with 2 oxygen sensors. On these models, Code 13 will set if the left sensor circuit is open. Code 63 will set if the right sensor circuit is open. Use this chart for Code 63 also and perform tests for applicable sensor.
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.