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)
///MAT: Does anyone have a list of what can cause the "Check Engine" light to come on?
If I give you the list, are you willing to spend your money on every possible code in the list? I think your best bet is A. a code reader/scanner for about $135-$145 and/or scan it for free.
Go to AutoZone and they will scan it for you for free. It will tell you exactly whats wrong.
Does it only come up on rainy days? Here is a long shot: When I went to get my brakes done to the dealer, they told me that I was missing a panel that goes inside the front fender (where your strut is ), on the pasanger's side. The guy said that there is a little pump there when it gets wet, my check engine light will come up. Once it goes bad, its like 700 bucks for a part.
I experienced a simular problem with my 98" 540I. I took it to the dealer three times. Every time after about 3 to 5 days the check engine light would come back on. They ran the codes several times, and could not resolve the problem. However, upon an indept engine inspection a service tech noted some stressed knocksensor/spark plug wiring. He also noted that someone had performed some cylinder head work on the vehicle in the past. He suggested that is what probably created the wiring stress and causing the problem. He repaired them and I have not had the problem since.
Fruthermore, my check engine light comes on whenever my wife attempts to SAVE MONEY and burns 87 octane gas in our 328I. I immediately go to sunoco and fill it up with 94 and the light goes away.
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