Okay, I’m not a big car guy, I have a small knowledge of cars and probably a lot less than others but my 2009 Chevy Malibu had a check engine light turning on and off for the mass air flow sensor. So i replaced it. The light didn’t go away, even after driving roughly 50 miles. I decided to replace …

The belt won’t cause the Check Engine light to come on. It is a separate problem. It may take more driving to turn off the light. It’s not just a matter of miles.

he code was P0171. But i changed the sensor and filter and is still there. And the first guy says a belt won’t cause the light to go on so I’m assuming it’s the same code

From the Interwebs… A code P0171 is a Bank 1 lean fuel condition. That may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty There could be a vacuum leak downstream of the MAF sensor Possible cracked vacuum or PCV line/connection Faulty or stu…

It’s a 4 cylinder, i don’t know if that narrows any problems down

Ooops, thought it was a 3.5 V6… that was another post. That only opens things up, unfortunately to all of these possible problems. Makes diagnosis more involved. How many miles on it? 10 years and 100,000+ could be a weak fuel pump - a pressure test should answer that. I don’t think this has a sep…

It has 123k miles, and I’ve tried using my hands to find leaks but couldn’t. I also disconnected the black terminal on the battery and it didn’t reset the code by instead made the car sound weak when turning on

[image] David_Trogdon: black terminal on the battery and it didn’t reset the code Then you still have the problem setting the code. If it sounds weak when you “turn it on” - crank it maybe? then you haven’t gotten the battery cable clean or tight. I think you are waiting for Monday to get it…

Will disconnecting the battery really clear an error code? I thought that capability went away before the OP’s car was built. :confused:

I believe it will also reset all of the learned engine operation memory and set it back to the original settings until more miles and key cycles are done. That could be why the engine is sluggish now. I think its time for a shop to take a looksee.

2009 Chevy Malibu air filter replacement problems

Maintenance/Repairs

Mustangman January 13, 2019, 6:04pm 3

So Sunday, take it to an auto parts store and they will read the codes for free. Post them back here in the form of the code… P0123, that form and we’ll try and help.

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2009 Chevy Malibu air filter replacement problems

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