p0102 , with some other lean codes, limp mode - Page 2

jdstrickland · 07-02-2012, 04:29 PM

I don't know what the input to the MAF is expected to be, but the code says the input is low. Not the output of the MAF, but the input to the MAF.

The MAF is supposed to make a signal, the code you have says that whatever the MAF is getting is not right, it does not say that what the MAF makes is not right. From what I have seen here -- and I've never seen this code -- I suspect that the supply-side TO the MAF is the problem, not the signal-side FROM the MAF.

Somebody posted here once upon a time that they had a MAF Error that was fixed by cleaning the contacts inside the connector. I don't recall what the error was that they were chasing, but it never hurts to see if the connection is good, or if a wire has broken. Something along those lines.

E25i46 · 09-07-2012, 09:23 AM

I too happen to encouter this code while I was replacing my intake boots, but for the stupidity of me decided to take out the screen of the MAF and didn't notice that I broke one of the wires for the MAF. Car went to limp mode and threw the same exact code (P0102). I went on to buy a new MAF. After I installed the new MAF, limp mode turned off and was left was the SES light in which after I erased the code. Like OP said if you happen to have this code and the car goes to limp mode its definitely the MAF that needs to be replaced.

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07-02-2012, 04:29 PM	#21
jdstrickland Registered User Join Date: Apr 2010 Location: Murrieta, CA Posts: 4,966 My Ride: '94 325iC & '00 323i View My Garage	I don't know what the input to the MAF is expected to be, but the code says the input is low. Not the output of the MAF, but the input to the MAF. The MAF is supposed to make a signal, the code you have says that whatever the MAF is getting is not right, it does not say that what the MAF makes is not right. From what I have seen here -- and I've never seen this code -- I suspect that the supply-side TO the MAF is the problem, not the signal-side FROM the MAF. Somebody posted here once upon a time that they had a MAF Error that was fixed by cleaning the contacts inside the connector. I don't recall what the error was that they were chasing, but it never hurts to see if the connection is good, or if a wire has broken. Something along those lines.

09-07-2012, 09:23 AM	#22
E25i46 Registered User Join Date: Jul 2012 Location: Bay Area, CA Posts: 25 My Ride: Small Displacement View My Garage	I too happen to encouter this code while I was replacing my intake boots, but for the stupidity of me decided to take out the screen of the MAF and didn't notice that I broke one of the wires for the MAF. Car went to limp mode and threw the same exact code (P0102). I went on to buy a new MAF. After I installed the new MAF, limp mode turned off and was left was the SES light in which after I erased the code. Like OP said if you happen to have this code and the car goes to limp mode its definitely the MAF that needs to be replaced.