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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 02-06-2013, 05:54 PM
trale trale is offline
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Location: Bay Area
 
Join Date: Jun 2004
Posts: 7
Mein Auto: Z3
96 Z3: changed air filter -> engine light (P0100 code, MAF Sensor problem)

I just changed the air filter on my 1996 Z3, which should be a no-brainer procedure (I've done it before).

But after I re-clipped the air filter housing, and started my car, the Check Engine light came on, and I read the ODBII code off it:

P0100 mass or volume air flow circuit

My reader can also track the air flow measurement of the car in real time. I took the car for a 20 mile trip, and it's recording 0. So it seems something is wrong is with the MAF sensor. I double-checked, and there was no change in the wiring, and nothing that was obviously "off". Incidentally, the car runs just fine. I hear no odd noises or notice any performance or behavior changes.

I also re-opened and re-closed the air filter housing, and cleared the engine light. It eventually came back. So this isn't a fluke.

At this point, the next step is to unplug and replug the MAF sensor, but it doesn't want to come out (I push in the metal clip and pulled, but it wouldn't budge)

Does anyone have any tips as to what to try or just how to unplug the MAF sensor?

(in hindsight maybe I should have left the air filter alone. the old one wasn't even that dusty)

Last edited by trale; 02-06-2013 at 05:59 PM.
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  #2  
Old 02-07-2013, 08:34 AM
postalZ3 postalZ3 is offline
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Location: California
 
Join Date: Jun 2006
Posts: 387
Mein Auto: 2000 Z3 2.8
Welcome! Where in the Bay Are? I'm in Fairfield, let me know if I can be of help.
The plug should come off by pushing down on the retainer clip. The MAF sensor probably just needs a good cleaning.
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Last edited by postalZ3; 02-07-2013 at 08:35 AM. Reason: location
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  #3  
Old 02-07-2013, 12:44 PM
trale trale is offline
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Location: Bay Area
 
Join Date: Jun 2004
Posts: 7
Mein Auto: Z3
Thanks postal. I did manage to unplug it and replug it back in, reset the engine light, and went for a short drive.

So far so good! Hope that's the end of it. So handy having a OBDII reader/reset device =) I take it you have one also?

BTW I'm in Milpitas/San Jose.
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Old 02-07-2013, 12:54 PM
postalZ3 postalZ3 is offline
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Location: California
 
Join Date: Jun 2006
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Mein Auto: 2000 Z3 2.8
Good, hopefully that's the end of it, if it comes back on, remove the MAF sensor and give it a good cleaning with CRC MAF cleaner. I also have the air bag reset tool and service lights.
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