ANSWERS: 2
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This depends upon the make and model of the car. some O2 sensors are as easy to replace as a spark plug, others require you to replace a significant portion of the exhaust system and still others are wedged into a place that is just about impossible to get to while the engine is sitting in the car.
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I guess "easy" is a matter of perspective... It all depends on your specific vehicle... some have the O2 sensor very simply located on the exhaust manifold... some are a real pain to get to, others are almost impossible... it all depends on your specific vehicle...
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