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)
New to the forum,well I have been here for a while but not registered till now .
I own a 1999 E39 528i for about 3 months now , great car. but I have been having some problems I'll appreciate any help with. check engine light it just keeps coming back every time I erase it with no error codes what soever , I have read from previous post here that it could be an air pump issue (where is the airpump )or an o2 sensor ? but if it is should'nt I get an error code ?
thanks for any help .
As you know, our cars have 4 sensors. I only replaced 2 when I hit 78k. My light did come on and got a code... Are you using the righ tool? The peak reader costs around $150. checkout the link above for codes.
Even if it was the mass flow sensors, you should get a code on your reader! Right?
Also, check autohausaz.com if you decide to buy the sensors. they usually have good prices on parts.
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