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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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Old 10-24-2004, 02:50 PM   #1 (permalink)
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Well.. all of the sudden, Service Engine Soon light came on in my 01 525i
I went to AutoZone and they plugged the thing in and it came with some fuel leak or soemthing like that. Guy said its probably my gas cap. So I checked it and it was a little loose. Well that was yesterday and the light is still on....

What else could it be? I don't remember exact error, but it was something with vapor, fuel and leak....I should of ask him to show me more details.
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Old 10-24-2004, 03:18 PM   #2 (permalink)
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maxxym

Gas caps do trigger the check engine light. If this is the only problem then your light will go off soon. If you're in rush you may disconnect the (-) terminal on your battery for a while then reconnect; this will reset your system providing no other problems present. But for sure it will disappear in 2-3 days if system checks OK

good luck
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Old 10-24-2004, 03:28 PM   #3 (permalink)
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ok.. thanks.. I was just wondering because this thing is on lol
But if it takes couple days, then I can live with it.
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Old 10-24-2004, 05:23 PM   #4 (permalink)
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This issue seems to pop up quite regularly doesn't it. It amazes me that the BMW sensor and control system is that sensitive it can detect of loss of fuel tank pressure due to the cap not being on properly.

People often find that replacing the fuel cap is enough to sort this problem out BUT sometimes not (there may be an underlying problem). Follow bills advise - make sure the cap is on properly then disconnect the neg lead from the battery, this resets all the warnings from the computer. Next run the car as normal and if the light comes on again shortly after, you may have bigger problems - now is the time to get your hands on a fault code reader.
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Old 10-25-2004, 02:21 PM   #5 (permalink)
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Yeah, probably the gas cap...I replaced mine a week ago...a whole $15 from the dealer
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Old 11-16-2004, 03:12 PM   #6 (permalink)
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thought I would give you guys an update. It was a gas cap. Dumbass me didn't turn it all the way.

Everything is peachy now
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