Heated Oxygen Sensor (All Models)

Heated oxygen sensor monitors exhaust gas oxygen content and delivers an input signal to Engine Control Module (ECM). ECM may use input signal for determining ignition timing (spark advance) and for controlling fuel injection system. Some models may be equipped with more than one heated oxygen sensor. A heater is used to warm oxygen sensor to improve heated oxygen sensor detection operation. Heater is controlled by ECM.

• Bank 1 (B1) refers to the bank that includes cylinder No. 1.
• Bank 2 (B2) refers to the bank opposite bank 1.
• Sensor 1 (S1) refers to the sensor that is located before the catalytic converters.
• Sensor 2 (S2) refers to the sensor that is located after the catalytic converters.