Circuit Description
WARNING: This page is about a different car, the 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
Heated oxygen sensor monitors exhaust gas oxygen content and delivers an input signal to ECM. Heated oxygen sensor No. 2 may be referred to as (bank No. 1 sensor No. 2) and is located on exhaust pipe behind catalytic converter. ECM uses input signal to determine fuel injection system operation. Heated oxygen sensors include a heater. DTC is set when heated oxygen sensor heater current draw exceeds 2 amps, or heated oxygen sensor heater current draw is .2 amp or less when heater operates. Possible causes are:
- Heated oxygen sensor No. 2 heater circuit is open or shorted.
- Defective heated oxygen sensor No. 2 heater.
- Defective ECM.