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Checking Oxygen Sensor (O2S) Heater

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.5L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-2  .
NOTE: Scan tool displays left oxygen sensor as O2 and right oxygen sensor as O2R.
  1. Turn ignition on. Wait 2 minutes for Oxygen Sensor (O2S) voltage to stabilize. Using scan tool, read left O2S voltage. If voltage is not 0.4-0.6 volt, go to step 4). If voltage is 0.4-0.6 volt, go to next step.
  2. Disconnect left O2S connector. Using scan tool in voltmeter mode, check voltage on left O2S connector terminal No. 4 (Light Green/Black wire). If voltage is less than 10 volts, repair open Light Green/Black wire. If voltage is more than 10 volts, go to next step.
  3. Using scan tool in ohmmeter mode, check resistance of left O2S connector terminal No. 3 (Black wire). If resistance is more than 5 ohms, repair open Black wire. If resistance is less than 5 ohms replace left O2S.
  4. If voltage is not 0.4-0.6 volt in step 1), read right O2S voltage. If voltage is not 0.4-0.6 volt, test passed. if voltage is 0.4-0.6 volt, go to next step.
  5. Disconnect right O2S connector. Using scan tool in voltmeter mode, check voltage on right O2S connector terminal No. 4 (Light Green/Black wire). If voltage is less than 10 volts, repair open Light Green/Black wire. If voltage is more than 10 volts, go to next step.
  6. Using scan tool in ohmmeter mode, check resistance of right O2S connector terminal No. 3 (Black wire). If resistance is more than 5 ohms, repair open Black wire. If resistance is less than 5 ohms replace right O2S.
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