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.
1995 Chrysler LHSFACTORY OEM SERVICE PROCEDURE
Checking Oxygen Sensor (O2S) Switching
NOTE:
Scan tool displays left oxygen sensor as O2 and right oxygen sensor as O2R. After each repair, perform TEST VER-2
.
- Allow engine to reach normal operating temperature. Using scan tool, read O2S states (left and right). Increase engine speed to more than 1500 RPM. If O2S states are switching, system is functioning okay. Test is complete. If O2S states are not switching, check if O2S is locked on lean. If O2S is locked on lean, go to TEST NTC-7B. If O2S is not locked on lean, go to next step.WARNING: High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE .
- Turn engine off. Release fuel pressure. Install fuel pressure gauge in fuel supply line. Turn ignition on. Using scan tool, actuate fuel system test. Allow fuel pressure gauge to stabilize to normal fuel pressure. Stop fuel system actuation test. Go to next step.
- Monitor fuel pressure gauge for one minute. If fuel pressure gauge reading drops more than 10 psi, replace leaking injector(s) or "O" rings as needed. If fuel pressure gauge reading does not drop more than 10 psi, go to next step.
- Inspect air cleaner and inlet ducts for restriction(s). Repair as required. If no restrictions are observed, go to TEST NTC-16A .
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.
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