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I have an 02 nissan altima, seller said the engine light is on because the oxygen sensor, took it to the mechanic he fixed it.but the light is still on. What do I do ?

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You should take it back to the mechanic that did the repair. There are about 20 codes related to the Oxygen (O2) sensors. If the mechanic is not available, then you need to get code that is triggering the engine light in order to find which of the sensors is the problem. There are 4 sensors in your 2002 Nissan Altima.

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