Oxygen Sensor Heater
The oxygen sensor heater warms the sensor so it works soon after a cold start.
What is Oxygen Sensor Heater?
Sensors only work above a certain temperature. The heater is an element inside the sensor. Faults set specific codes. Checking heater resistance with a multimeter and checking for power at the connector are common tests. A blown fuse can disable several sensor heaters at once. The heater circuit is monitored by the engine control unit, so a fault usually turns on the engine warning light quickly.
How it works
Current through the element warms the sensor tip.
Why it matters for your car
A failed heater delays closed loop. Usually the whole sensor is replaced.
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