1/1 O2 Sensor Heater Failure (OBD II)

1/1 UPSTREAM

Name of Code:
O2 Sensor Heater Failure

When Monitored:
With the engine at idle immediately after a cold start (engine <147 ° F and battery temp +/- 27 ° F of engine temperature).

Set Condition:
O2 sensor voltage > 3V for 30 to 90 seconds.

Theory of Operation:
The oxygen sensor is a voltage generating device. The PCM receives exhaust gas information from this O2 sensor. The sensor detects exhaust gas content by a galvanic reaction with in the sensor that produces a voltage. After measuring the amount of oxygen in the exhaust gases. This O2 sensor serves as an indicator of oxygen content. The heater element helps the O2 sensor quickly reach a normal and steady operating temperature, which is required for proper emission control.

Possible Causes:
- Open heater element circuit
- O2 sensor failure
- O2 heater wiring
- Powertrain control module failure
- Connector terminals
- Connector wires