The O2 sensor heater circuit is located in the exhaust manifold, near the oxygen sensors. The heater circuit is a small, metal coil that is wrapped around the oxygen sensor. When the engine is cold, the heater circuit turns on and heats up the oxygen sensor. This helps the oxygen sensor to reach its operating temperature quickly so that it can start sending accurate signals to the engine control module (ECM).
Here are the steps on how to locate the O2 sensor heater circuit:
1. Open the hood of your Tundra.
2. Locate the exhaust manifold. It is located on the side of the engine block, near the top.
3. Look for the oxygen sensors. They are small, cylindrical sensors that are screwed into the exhaust manifold.
4. The O2 sensor heater circuit is located near the oxygen sensors. It is a small, metal coil that is wrapped around the oxygen sensor.
If you are having problems with your O2 sensor heater circuit, you may need to replace it. Here are the steps on how to replace the O2 sensor heater circuit:
1. Disconnect the negative battery terminal.
2. Remove the oxygen sensor.
3. Unwrap the old heater circuit from the oxygen sensor.
4. Wrap the new heater circuit around the oxygen sensor.
5. Reinstall the oxygen sensor.
6. Reconnect the negative battery terminal.
Replacing the O2 sensor heater circuit is a relatively simple task that can be completed in about 30 minutes. If you are not comfortable working on your own vehicle, you can have a qualified mechanic replace the O2 sensor heater circuit for you.
