BMW Forum - BimmerFest BMW Forums banner

MAF sensor location

1 reading
6.3K views 8 replies 6 participants last post by  musthaveryan  
#1 ·
I am getting both a 29E0 and a 29E1 error code on my 2008 BMW 535xi LCI E60 N54 car. Those letters may be jumbled but I think you will get the gist.
Anyway, I replaced my MAP sensor and I am looking for my MAF sensor which I cannot find a video online to show me where it is. I want to try cleaning it before I replace it but first I have to find it. One online post, not from this group, suggests that I don't have one but because I can find a replacement part I suspect it is there someplace.
Thanks,
 
#2 ·
You don't have a MAF sensor. You have two MAP sensors, one by the throttle body which is mainly used as an intake air temp sensor and the one for fueling is on top of the intake manifold (by cylinder 5 or 6).

I would look into O2 sensors or fuel injectors but I'm not saying just go replace them, I would see if you can troubleshoot in that direction. Perhaps look at your long term fuel trims between banks 1 and 2.
 
owns 2009 BMW 535xi Wagon
#3 ·
Thanks, I finally found the second MAP sensor. tricksters hid it well. After replacing it we noticed it takes much longer for the errors to show back up but a significant improvement in the fuel consumption. Our new codes are now, Combustion misfires, cylinder 3, Absolute-pressure sensor, intake manifold: signal and Throttle-valve angle - intake manifold vacuum, correlation. I am checking as well as I can for potential vacuum leaks but I don't readily see any. Any suggestions would be a great help.
 
#4 ·
Image
Ok finally got to the part of checking the O2 Sensors this is a screen shot of what the OBD2 read.I tried checking online to find out what the values should read I could not find anything specific for my car. What I did find was a couple videos saying both should read somewhere around .5V so my guess is the sensor before cat. is needing replaced.(unless there is a cleaning that can be done) Anyway before I purchase and replace I wanted to make sure I was headed in the right direction. Thanks,