Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.

For wiring diagram, see Fig 1. For diagnosis and repair, see Fig 2.

Fig 1: Oxygen Sensor Heater Control Circuit (Sensor 2) Wiring Diagram

Fig 2: Diagnosis & Repair Of Rear Oxygen Sensor Heater