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Home >> Mercedes Benz >> 1989 >> 560SL >> Repair and Diagnosis >> Engine Performance >> System >> System/Component Tests >> Engine Sensors & Switches >> Oxygen (O2) Sensor Test
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Oxygen (O2) Sensor Test

  1. Disconnect oxygen sensor plug and connect male terminal to ground. Start engine. Test sensor voltage between female terminal and ground. Sensor voltage should be near 450 mV. If not about 450 mV, replace oxygen sensor. If okay, go to next step.
  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 resistance is not about zero ohms, repair circuit. If okay, test is complete.
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