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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > Canada > Canada Classifieds Section > FS: N52 Mass Airflow Sensor



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      11-25-2017, 12:33 AM   #1
starbuck
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FS: N52 Mass Airflow Sensor

I bought this thinking I had an issue with my MAF however soon realized my issue was a separate vacuum leak... as my original MAF is working, I am selling this MAF that I purchased a month ago at GermanParts.ca for $350

My loss is your gain. I am selling well under purchase price.

Price : 150
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      11-25-2017, 01:32 AM   #2
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Out of curiosity, what were your symptoms and how'd you find the vacuum leak?
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      11-25-2017, 02:17 AM   #3
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I had a an erratic idle when in park or in drive at a stop. I also had lean codes when scanning with inpa and then more recently a p1415.

I changed the maf, plugs, air filter and ran a bottle of fuel injector cleaner with no luck. Finally got it smoke tested and a leak was detected in one of the vacuum hoses.

Last edited by starbuck; 11-25-2017 at 09:34 AM.
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      11-26-2017, 07:24 PM   #4
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Quote:
Originally Posted by starbuck View Post
I had a an erratic idle when in park or in drive at a stop. I also had lean codes when scanning with inpa and then more recently a p1415.

I changed the maf, plugs, air filter and ran a bottle of fuel injector cleaner with no luck. Finally got it smoke tested and a leak was detected in one of the vacuum hoses.
Which hose was the culprit if you don't mind me asking?
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      12-05-2017, 12:24 PM   #5
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Quote:
Originally Posted by starbuck View Post
I bought this thinking I had an issue with my MAF however soon realized my issue was a separate vacuum leak... as my original MAF is working, I am selling this MAF that I purchased a month ago at GermanParts.ca for $350

My loss is your gain. I am selling well under purchase price.

Price : 150
Whats the part number on the maf?
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      12-10-2017, 10:34 PM   #6
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Part number is 5wk97502z

And the vacuum leak was the hose connecting to ccv.
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      12-11-2017, 10:49 AM   #7
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Sometimes air fuel error codes are from the MAF connector and not the actual sensor. I was trouble shooting similar lean/rich error codes for about a half a year until I came upon this thread:

http://www.e90post.com/forums/showthread.php?t=905209

I followed the instructions and changed my connectors and haven't had an error code yet! I believe if you snapped your MAF connector clip (pretty common) the missing material lets in additional moisture which compromises the connection causing the error codes. Worth a read, saved me tons of troubleshooting dollars chasing the annoying codes.
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      12-11-2017, 08:41 PM   #8
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I had read that post as well and changed my connector before figuring out it was the vacuum leak : )

A lot of work before finding the solution
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      12-15-2017, 10:52 PM   #9
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