This means there's an issue with the electrical circuit that heats the oxygen sensor. The heater is important because it allows the sensor to reach operating temperature quickly, improving accuracy and emissions control. A faulty heater can lead to:
* Slow engine warm-up: The engine may take longer to reach optimal operating temperature.
* Poor fuel economy: Inaccurate readings from the O2 sensor can cause the engine to run rich or lean, wasting fuel.
* Check Engine Light (CEL): The CEL will illuminate, indicating the problem.
* Increased emissions: Inaccurate fuel mixture can lead to higher emissions.
Troubleshooting Steps:
* Check the wiring and connector: Inspect the wiring harness and connector to the O2 sensor for any damage, loose connections, or corrosion. This is often the most common cause.
* Check the O2 sensor itself: While less common, the O2 sensor itself may be faulty. A mechanic will need to test the sensor's functionality.
* Check the fuse: There might be a related fuse that's blown. Consult your vehicle's owner's manual to find the fuse box and the relevant fuse.
It's crucial to have this diagnosed and repaired by a qualified mechanic. Simply replacing parts without proper diagnosis might not solve the underlying problem and could lead to further damage. They will have the right tools to test the circuit and sensor properly.
