Check Engine Light - 93 525i (E34) - BMW Forum - BimmerWerkz.com
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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#1 (permalink) Old 06-02-2008, 10:31 PM
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Check Engine Light - 93 525i (E34)

I just bought a used 525i with the check engine light on. The engine seems to run fine but I live in California and the car cannot be registered without passing a smog test. However, I am told it won't pass smog as long as the check engine light is on.

My question is, will the check engine light go off automatically if the problem is fixed or does the system have to be reset by some mean. I was thinking maybe changing the plugs and doing a tuneup might do the trick without having to go to the dealer.

Any advice would be welcome.

Thanks
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#2 (permalink) Old 06-03-2008, 10:01 PM
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get it scanned so you know what the problem is. That is the sane way to diagnose probs instead of blindly changing this and that as you go...
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#3 (permalink) Old 06-04-2008, 02:53 PM
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I just received the Bentley repair manual in the mail and it describes in detail how to retrieve and clear the "check engine" codes on page 100-8 through 100-10. It also gives a detailed list of what the codes are. Looks like the manual will be well worth the money.

Thanks

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#4 (permalink) Old 06-05-2008, 12:49 AM
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yes do gas pedal test to see ECU codes and diagnose problem that way. most likely on for a reason.
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#5 (permalink) Old 06-07-2008, 06:35 AM
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buy a code reader !!! it pays for it self after like two uses
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#6 (permalink) Old 06-08-2008, 12:24 AM
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listen to all the posts. get it scanned. It may be worth it to buy your own scanner. The pedal trick is also good to do, because it can read codes that the scanner cannot, because the check engine light does not always come on with thrown codes.

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