check engine light on, replaced maf sensor as per obd2 light turned off with obd2, 10 miles later light back on
You might have a vacuum leak somewhere. When un-metered air is getting in to intake, the OBDII uses that along with MAF, Manifold Absolute pressure sensor to correlate how much air flow should be coming in @ certain rpm. You don't say what code, but I bet it is P0100, P0101, or P0102. That does indicate a Possibly bad MAF, but could be an electrical connector problem with the MAF not the unit it's self, but that or a vacuum leak. Look for and vacuum hoses that have come off, a 2012 is too soon to have them just worn out. There is an TSB (Technical Service Bulletin) for the 2012 Nissan Altima, Bulletin No. NTB12-051d which is that if replacing the MAF and light re-appears you may have to re-program the ECU. See http://engine-codes.com/p0101_nissan.html
What trouble code(s) do you have? Please post them so we can help. -Jim
Very helpful, that was the right answer. Thank you.
That was the correct answer. Thank you.
my check engine light has been on for almost 3 years and the code reads for the Mass air flow sensor. but my car still drives. should i replace the MAF. i purchased one the other day but havent put it in yet
I got a bad maf sensor code. replaced sensor! saw tech service bulletin , called to see how much to reprogram computer which is the factorys fault that they sell the car with a glitch. they said at the dealer as the private garages said only the dealer can re program the computer since the equipment costs $100,000. I asked the dealer how much?they said first they replace the MAF sensor which I just bought. then they reprogram the defect in my computer they sold me when I bought the car new! seems it would be around $200.00. so I bought a reader for $20.00 and every time the light comes on I shut it off. I got tired of doing that so I have black duct tape which I cut out a small piece and block out the light. and since Nissan is at fault I will remember this and buy a Toyota next car but first I will remove the tape and use my OBD 2 and turn out the light before selling! you know the old saying "let the buyer beware"
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