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Home >> Mercedes Benz >> 1985 >> 190E Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH Cis-E >> Testing - MERCEDES-BENZ >> Electrical Components >> O2 Sensor Heater

O2 Sensor Heater

  1. Pull O2 sensor heater wiring connector slightly but do not fully disconnect. Unplug fuel pump relay and bridge sockets 7 and 8 with jumper wire. Check voltage at connector to heater. If reading is not 12 volts, repair wiring.If reading is 12 volts, go to next step.
  2. Disconnect O2 sensor heater connector completely. Connect Test Cable (102 589 04 63 00) and read current value on multimeter. If current is not greater than .5 amps, replace defective O2 sensor. If current is greater than .5 amps, O2 sensor is good and test is complete.
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