Question about 2003 Toyota Highlander
Your O2 sensor heater circuit is not working. Can be caused by wiring, including connector, or sensor. Check connector. If good, it's probably the sensor. You can troubleshoot the sensor if you have an ohmmeter. If you want to do this, please get back to me and I'll send instructions.
The sensor is screwed into the exhaust manifold on the front of the engine.
Posted on Oct 11, 2010
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Posted on Jan 02, 2017
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