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 SENSORSERVICE AND REPAIRREMOVE AND INSTALL
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Remove and Install
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Remove and Install
Fig. 21 Oxygen Sensor:
Oxygen Sensor Replacement:
1. Disconnect oxygen sensor wire plug.
2. Remove the heat-shield in front of sensor (if equipped).
3. Unscrew the oxygen sensor.
4. Coat threads of new sensor with "anti-seize" lubricant (don't get any lubricant an to the tip of sensor, this could render the sensor inoperative), Fig. 21.
5. Install new oxygen sensor and torque to 55 ± 5 Nm (40 ± 3 ft. lbs.).
6. Reinstall the heat-shield.
7. Reconnect oxygen sensor wire plug.
RENDER: 1.0x
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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.