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Home >> Mercedes Benz >> 1987 >> 300E >> Repair and Diagnosis >> Engine Performance >> System >> BOSCH Cis-E System >> Component Testing >> Deceleration Shut-Off >> Oxygen Sensor

Oxygen Sensor

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Oxygen sensor must be tested with engine running and at operating temperature. Unplug oxygen sensor under right front floor mat. Start engine and set speed at 2000 RPM. Check voltage of sensor between connector and ground. If reading is greater than 450 mV, oxygen sensor is good and test is complete. If reading is below 450 mV, replace oxygen sensor.