I have a 2000 Toyota Celica that has a check engine light on. The OBD code is P0141...02 sensor heater malfunction (bank1 sensor2). Does anyone have any idea what part to replace?
by 
Whiskeybrown
ANSWERS: 1
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Usually when one oxygen sensor (O2) go it's best to replace both of them, but that's up to you. It will cost you anywhere from $75 to $175 per sensor--even more if a shop does them. It's not hard to do with the right wrench. One is usually located on the exhaust manifold and the other on the exhaust pipe. The look like a metal "tube", about 4-5 in. with a wire sticking out. The wire has a connector at the other end that can just be unplugged. This website might save you money on parts: PartsAmerica.com If you are going to be working on your car you should get a shop manual specific for your car. That way if you want to only replace one 02 sensor you can locate exactly which one.I would still recommend replacing both.
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