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07' Nissan Sentra SER Needs help with a Check Engine Light Issue!

Getting Error P2a03 from the OBD guage. We've had the O2 sensors checked, and they all seem functional. Mechanic thinks it needs new gaskets.

Any thoughts?

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This post from a Nissan Z forum seems to say that it was in fact a faulty O2 sensor. If you read the replies someone does mention something about a gasket, but that it was for a P2A00, not P2A03.

The original poster there had an incident where he scraped the bottom of his car. Did anything like that happen to your Sentra?

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