Mass Air Flow Meter issue - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 08-17-2007, 04:57 PM
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Mass Air Flow Meter issue

Well it finally happened. My MAF meter went south and the car won't stay running without me keeping constant pressure on the gas pedal. I checked the codes and it indicated it was indeed the MAF. In addition to the MAF going bad, a code for both 02 sensors (adaptation limit reached) appeared.

My plan is to get a new or slightly used MAF and replace the broken one and clear the codes. This is basically a plug and play deal. I tried cleaning it but the "cross hair: plastic piece inside the housing is broken so I should just replace the whole thing.

My question is this. IF the replacement MAF doesn't work, I am scheduled to take her into the shop on the 27th. Is there a way I can bypass the MAF just to get it to the shop to avoid a tow? I read somewhere you can unplug it?

Thanks all!

1998 528i - sold 222,000 miles
1998 540i - sold 159,000 miles
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#2 (permalink) Old 08-17-2007, 06:33 PM
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There is no way to bypass the MAF and keep the car driveable. The O2 sensor code is from the MAF going bad and messing up the A/F mixture past where the O2 sensors can adjust it. If you replace the MAF and reset the codes and adaption values it should be ok as long as there are no other problems with the car.
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#3 (permalink) Old 08-17-2007, 09:40 PM
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It's a pain, but you really ought to just replace the MAF with a new one. Try getcoolparts.com. The MAFs fail often so getting a used one won't buy you much time....

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#4 (permalink) Old 08-17-2007, 11:07 PM
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I dunno about the MAF sensor in the Bimmer, but when mine failed in the E39, the car won't even start.

In the 911, you can remove the MAF sensor and bypass it, and still drive the car. It's actually one of the procedures used to test if the MAF sensor is faulty, but there are certain simple steps to make to avoid a CEL when driving without the MAF sensor.

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#5 (permalink) Old 08-18-2007, 02:01 PM
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Quote:
Originally Posted by BMWJNKY
There is no way to bypass the MAF and keep the car driveable. The O2 sensor code is from the MAF going bad and messing up the A/F mixture past where the O2 sensors can adjust it. If you replace the MAF and reset the codes and adaption values it should be ok as long as there are no other problems with the car.
I can reset the fault codes. Will this reset the adaptation limits for the sensors too or will I need to disconnect the battery for awhile?

1998 528i - sold 222,000 miles
1998 540i - sold 159,000 miles
2007 328i Coupe - 30,000 current
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#6 (permalink) Old 08-18-2007, 02:05 PM
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Quote:
Originally Posted by Eric S.
It's a pain, but you really ought to just replace the MAF with a new one. Try getcoolparts.com. The MAFs fail often so getting a used one won't buy you much time....

Thanks Eric. I suspect you are right on getting a new one. I'll check it out.

1998 528i - sold 222,000 miles
1998 540i - sold 159,000 miles
2007 328i Coupe - 30,000 current
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#7 (permalink) Old 08-20-2007, 12:32 PM
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Quote:
Originally Posted by ozarkmark
I can reset the fault codes. Will this reset the adaptation limits for the sensors too or will I need to disconnect the battery for awhile?
Disconnecting the battery does ok at resetting the adaptation values but the best way to do it is go into the computer with a GT1 or AutoLogic and reset it.
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#8 (permalink) Old 08-20-2007, 08:11 PM
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Originally Posted by BMWJNKY
Disconnecting the battery does ok at resetting the adaptation values but the best way to do it is go into the computer with a GT1 or AutoLogic and reset it.
How much does a GT1 or Autologic cost vs. disconnecting th battery?

1998 528i - sold 222,000 miles
1998 540i - sold 159,000 miles
2007 328i Coupe - 30,000 current
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#9 (permalink) Old 08-24-2007, 07:49 PM
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Quote:
Originally Posted by ozarkmark
How much does a GT1 or Autologic cost vs. disconnecting th battery?
Do you want to band-aid it or fix it?
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