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 MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSCHECKING FUNCTION OF OXYGEN SENSOR
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Checking Function of Oxygen Sensor
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Checking Function of Oxygen Sensor
CHECKING FUNCTION OF OXYGEN SENSOR
- Unscrew plug (1).
- Screw in Special Tool 13 0 100 and attach the Special Tool 13 0 090.
- Connect the BMW service tester
- Measure the CO level
- Specifications: 0.2 to 1.2% by volume.
- Pull off vacuum hose (1) on the pressure regulator and plug.
- The CO level will rise briefly and is immediately regulated back to the original value = the oxygen sensor is working.
If Not:
- Check the power supply to the oxygen sensor from the relay according to the wiring diagram.
RENDER: 1.0x
NO RELATED
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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.