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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 02-25-2009, 07:40 PM   #1 (permalink)
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MAF Sensor "Lifespan"?

Anyone know how long the mass airflow sensor is expected to last?
I have 130K, SES light, and lean codes 0171 and 0174. Parts chasing with an item this costly is well, costly, but can't find a leak, and am leaning toward replacing the MAF if the lifespan is around 7 years anyway.
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Old 02-25-2009, 08:29 PM   #2 (permalink)
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A few things......1st, I would think @ 130k, yes it is very likely that the MAF can be done, 2nd, did you try cleaning it & 3rd, unplugging the MAF provides a good test to see if your MAF is dead. If the engine runs better with the MAF disconnected, it is likely your MAF is not functioning.

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Old 02-25-2009, 08:30 PM   #3 (permalink)
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Most E39 MAF's don't last nearly that long. They're a very failure-prone part on our cars.
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Old 02-25-2009, 08:31 PM   #4 (permalink)
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johnny,
Yea, I cleaned it, twice, w/ electronics cleaner, but thanks for the unplugging tip! I'll try it. It does not really run bad though, just a little rough idle.
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Old 02-25-2009, 08:36 PM   #5 (permalink)
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Most E39 MAF's don't last nearly that long. They're a very failure-prone part on our cars.
Thanks, Prof
I found one for $201.77 on line. Hows that sound?
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Old 02-25-2009, 08:47 PM   #6 (permalink)
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Quote:
Originally Posted by longrob View Post
Thanks, Prof
I found one for $201.77 on line. Hows that sound?
That sounds good....lower than the 2 prices I found....

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Old 02-26-2009, 06:08 AM   #7 (permalink)
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Do not buy a cheap version, make sure its a Bosch, or you will find it will need replacing again in the not so distant future.
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Old 02-26-2009, 06:46 PM   #8 (permalink)
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marti5,
thanks for the tip. Have a source? I did not find a Bosch air mass meter for my 2002 530.
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Old 03-23-2009, 03:48 PM   #9 (permalink)
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Most E39 MAF's don't last nearly that long. They're a very failure-prone part on our cars.
I replaced the MAF sensor and I am good to go. SES light has not reappeared in 300+ miles. Thanks all!
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