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.
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HOMESERVICE MANUALSBMW1992850I AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SELF DIAGNOSTICSCOMPONENT TESTSOXYGEN SENSORCHECK FUNCTION
1992 BMW 850i Automatic
Check Function
1992 BMW 850i AutomaticSECTION Check Function
- To carry out this check, oxygen sensor must be at operating temperature. The indicated voltage signal is picked off in steps and fluctuates between 0.02-0.85 volt.
- When oxygen sensor is not in operation, or wire to DME control unit is interrupted, the constant value of 0.45 volt is indicated. This value is also indicated when no oxygen sensor is installed.
- An oxygen sensor may be defective (for example, due to deposits) and still indicate required voltage signals. An indication for such cases is CO measured values deviating from nominal value despite the emission control system being active.
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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.