Heated Oxygen Sensor
- Two heated oxygen sensors are used. A heated oxygen sensor is used on exhaust pipe in front of front catalytic converter and on exhaust pipe behind rear catalytic converter.
- If problem exists with heated oxygen sensor, a diagnostic trouble code will be stored in Engine Control Module (ECM). For diagnostic trouble code diagnosis, see TESTS W/CODES
article.
- To test the heater on the heated oxygen sensor, disconnect electrical connector from appropriate heated oxygen sensor and note heated oxygen sensor terminals. See Fig 1.
- Using ohmmeter, check resistance between heated oxygen sensor terminals +B and HT. See Fig 1. Replace heated oxygen sensor if resistance is not 11-16 ohms at 68°F (20°C).
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