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Oxygen Sensor Heater

  1. Pull oxygen sensor heater wiring connector slightly but do not fully disconnect. Unplug fuel pump relay and bridge sockets No. 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 oxygen 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 oxygen sensor. If current is greater than .5 amps, oxygen sensor is good and test is complete.
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