Heated Oxygen Sensor: Camry
- A heated A/F sensor is mounted on exhaust manifold above catalytic converter. For testing of A/F sensor, see AIR/FUEL SENSOR . Another heated oxygen sensor is mounted on exhaust pipe after catalytic converter. This heated oxygen sensor is referred to as bank No. 1 sensor No. 2.
- To test heater resistance on heated oxygen sensor, disconnect electrical connector for heated oxygen sensor. Using ohmmeter, check resistance between +B and HT terminals on electrical connector. See Fig 1. Replace heated oxygen sensor if resistance is not 11-16 ohms at 68°F (20°C). See HEATED OXYGEN SENSOR
under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.
- To check that heater is not shorted, using ohmmeter, check that no continuity exists between E1 and HT terminals on electrical connector. See Fig 1. Replace heated oxygen sensor if continuity exists. See HEATED OXYGEN SENSOR
under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.
- If problem exists in heated oxygen sensor, heater or wiring circuit, a Diagnostic Trouble Code (DTC) may be stored in Engine Control Module (ECM). See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
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