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Oxygen (O2) Sensor (Heating Element)

  1. Disconnect oxygen sensor connector. Using an ohmmeter, check sensor heating element resistance.
  2. On Comanche and Cherokee, connect ohmmeter to Black/Tan and Dark Green/Black sensor wires. On Wrangler, connect ohmmeter to Black and Dark Green/Black sensor wires.
  3. Heating element resistance should be 5-7 ohms. Replace oxygen sensor if ohmmeter reads infinity.
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