Camry Gasoline Models Except Calif. Emission Vehicles & Camry Solara Except Calif. Emission Vehicles

A heated oxygen sensor is mounted near exhaust manifold. This oxygen sensor is referred to as bank No. 1 sensor No. 1, or front oxygen sensor. Another heated oxygen sensor is mounted on exhaust pipe behind catalytic converter. This oxygen sensor is referred to as bank No. 1 sensor No. 2, or rear oxygen sensor.
To test heater resistance on any oxygen sensor, disconnect electrical connector for appropriate heated oxygen sensor. Electrical connector for bank No. 1 sensor No. 1 is located near upper radiator hose. See Fig 2. Electrical connector for bank No. 1 sensor No. 2 is a Dark Gray, 4-pin electrical connector located below passenger-side front seat and carpet, near center console. See Fig 1.
Using ohmmeter, check resistance between +B and HT terminals on electrical connector. See Fig 1 and Fig 2 . Replace heated oxygen sensor if resistance is not 11-16 ohms at 68°F (20°C).
If problem exists in either heated oxygen sensor, heater or wiring circuit, a Diagnostic Trouble Code (DTC) may be stored in Engine Control Module (ECM). See SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article for retrieving and servicing of DTCs.

Fig 1: Locating Electrical Connector & Testing Bank No. 1 Sensor No. 2 Oxygen Sensor (Camry CNG & Gasoline Models, & Camry Solara)

Fig 2: Locating Electrical Connector & Testing Bank No. 1 Sensor No. 1 Oxygen Sensor (Camry Gasoline Models Except Calif. Emission Vehicles & Camry Solara Except Calif. Emission Vehicles)