Bad MAF?
Thread Starter
Joined: Mar 2011
Posts: 2,688
Likes: 19
From: Stratford, CT
Bad MAF? Not sure if this in the right section but Iv been getting bank 1 and 2 lean codes that have been going on randomly. I checked for vacuum leaks and found nothing. Today I cleaned the MAF with cleaner then the ses light turned off. The next time I went to start the car, it came back on when I was in my driveway so while it was running I unplugged it and it still ran as if i did nothing. Then I ended up taking it off completely and it still ran the same. Not sure if this is relevant or not but the car has a high number of miles and when I bought it the MAF was on backwards (Screen facing throttle body) with all sorts of crap in it. Is my Maf bad or should there be something else I should look for
Launching!
Joined: Dec 2009
Posts: 273
Likes: 0
From: California
Did you replace the MAF in it's normal position?
The MAF could be bad if someone messed with it.
Clean it, install back into engine and check it again.
Un plug your battery for a few minutes 1st.
Then see what happens.
If it corrects itself, your ok.
If not, time for a new MAF.
The MAF could be bad if someone messed with it.
Clean it, install back into engine and check it again.
Un plug your battery for a few minutes 1st.
Then see what happens.
If it corrects itself, your ok.
If not, time for a new MAF.
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I had Bank 1 and Bank 2 lean codes 2 months after putting in 2 new 02 sensors. One was a dud.......and it caused the other Bank to throw codes too.
Get a scan and see how the 02 sensors are switching.......one of mine showed 0-4, it was a dud. It caused the other to show lean, slow repsonse and low voltage CODES.
I put 2 new ones in tonight.....all better.
Moral of the story: One bad 02 sensor will cause the other one to throw false codes. Real codes, but false because the bad 02 sensor is messing up everything....
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Get a scan and see how the 02 sensors are switching.......one of mine showed 0-4, it was a dud. It caused the other to show lean, slow repsonse and low voltage CODES.
I put 2 new ones in tonight.....all better.
Moral of the story: One bad 02 sensor will cause the other one to throw false codes. Real codes, but false because the bad 02 sensor is messing up everything....
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As common as they go bad on these cars, I'm surprised nobody has mentioned your intake gaskets possibly leaking. On a cold start you can spray some carb cleaner around the intake and see if your idle changes.
With these codes, it can be alot of things but the key is to figure it out as cheaply as possible. I would hold off on buying new o2's or a new MAF until you exhaust the free or cheaper options first.
With these codes, it can be alot of things but the key is to figure it out as cheaply as possible. I would hold off on buying new o2's or a new MAF until you exhaust the free or cheaper options first.
As common as they go bad on these cars, I'm surprised nobody has mentioned your intake gaskets possibly leaking. On a cold start you can spray some carb cleaner around the intake and see if your idle changes.
With these codes, it can be alot of things but the key is to figure it out as cheaply as possible. I would hold off on buying new o2's or a new MAF until you exhaust the free or cheaper options first.
With these codes, it can be alot of things but the key is to figure it out as cheaply as possible. I would hold off on buying new o2's or a new MAF until you exhaust the free or cheaper options first.
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Thread Starter
Joined: Mar 2011
Posts: 2,688
Likes: 19
From: Stratford, CT
Thanks guys I already got a new Maf and o2's, and yes, I recently changed the fuel filter. After the code went away I was able to borrow a scan tool and it popped up with a low voltage code, I forgot to write it down so idk the number.
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If you have an exhaust leak within like 10 inches AFTER the 02 sensor.......it will cause problems. The air in the exhaust tubes actually go back and forth in them......if it sucks air in and reaches the 02 sensor thats bad.
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