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Q: P0101 Still shows after MAF replacement.

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Received a P0101 on my Nissan Altima and brought it in to the mechanics. They replaced my MAF sensor and the check engine light was turned off. After about a week, the engine light is back on and fuel efficiently is noticeably impacted. I believe there is a TSB to have ECU rebooted. Could not resetting ECU be a reason why my fuel efficiency is impacted or could there be another issue at hand?

My car has 47000 miles.
My car has an automatic transmission.

You are correct, there is a TSB to reprogram the ECU for the symptoms you describe. The reprogramming should take care of your concern of the P0101 code. You will need to go to a Nissan dealer to have the ECU re-programmed.

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