Heated Oxygen Sensor: Avalon
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sienna, 2002 Toyota Sequoia, and 2002 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
- A heated Air/Fuel (A/F) sensor is used on each exhaust manifold and heated oxygen sensor is used on exhaust pipe behind catalytic converter. For testing of A/F sensor, see AIR/FUEL SENSOR . Heated oxygen sensor on exhaust pipe behind catalytic converter may also be referred to as bank No. 1 sensor No. 2.
- To test heater on heated oxygen sensor, disconnect electrical connector for heated oxygen sensor and note heated oxygen sensor terminals. See Fig 1. Electrical connector for heated oxygen sensor is located below passenger's side front seat, near center console and contains a Dark Gray 4-pin electrical connector.
- 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) and 23-32 ohms at 1472°F (800°C). See HEATED OXYGEN SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 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.