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.
1992 Eagle Premier ESFACTORY OEM SERVICE PROCEDURE
Test NF-6A - Checking Oxygen (O2) Sensor Switching
- Allow engine to reach normal operating temperature. Using DRB-II, read O2 sensor state. If O2 sensor state is switching, system is functioning okay. If O2 sensor state is not switching and locked on lean, perform TEST NF-6B. If O2 sensor is not locked on lean, turn engine off.
- Let engine cool for 5 minutes. Remove and inspect spark plugs for wet tips or fuel fouling. If either condition exists, replace leaking injectors at corresponding cylinders. Perform VERIFICATION PROCEDURE VER-3.
- If neither condition exists, inspect air cleaner and air inlet ducts for restrictions. Clean restricted air inlet as necessary. Perform VERIFICATION PROCEDURE VER-3. If air inlet is not restricted, perform TEST NF-13A.
Factory Service Tools
Use the Manual With the Right Hardware
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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.