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Home >> Mercedes Benz >> 1986 >> 560SL >> Repair and Diagnosis >> Engine Performance >> System >> Cis-E System >> Diagnostic Testing >> Test 6 >> Test Oxygen Sensor
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Test Oxygen Sensor

NOTE: If oxygen sensor signal is not present, the oxygen sensor malfunction indicator on the instrument panel will light up.
  1. Disconnect oxygen sensor plug and connect male part of plug to ground. Start engine. Test sensor voltage between female part of plug and ground. Sensor voltage should be around 450 mV. If not okay, replace oxygen sensor. If okay, go to step 2).
  2. Stop engine. Check wire from oxygen sensor plug to CIS-E control unit (terminal No. 8) for continuity. Resistance should be about zero ohms. If not okay, repair interruption. If okay, test is complete.
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