Checking Components

Checking Components







CAUTION: Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.

Check the rear heated oxygen sensor connector (bank 1). Check for contact resistance and oxidation.

Check the cable between rear heated oxygen sensor (HO2S) terminal #1 and voltage supply from the system relay. Check for an open-circuit. Check for a short-circuit to ground.

Try a new rear heated oxygen sensor if the above measure does not remedy the fault.

Remedy as necessary.

Other Information
- Connecting the breakout box
- Signal specification, engine control module (ECM)
- Heated oxygen sensor (HO2S), replacing
- Checking wiring and terminals

Continue: Refer to Verification. Verification