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.
1985 Porsche 944 AutomaticFACTORY OEM SERVICE PROCEDURE
Oxygen Sensor
- Connect an exhaust gas analyzer to test point. Warm engine to operating temperature. Disconnect oxygen sensor wire. Note CO% level.
- Disconnect and plug the vacuum hose from the fuel pressure regulator. The CO% level should increase. Reconnect the oxygen sensor wire. The CO level should decrease to 0.4-0.8%. If not, test the DME control.
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.