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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 04-28-2004, 12:13 PM   #1 (permalink)
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What is the first step to fix my 1992 525i? The check engine light came on. The book that comes with it says it may be a emmission control problem. What does that exactly mean?
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Old 04-28-2004, 04:12 PM   #2 (permalink)
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I've had the same problem before on my 97 540i...Generally it means that the catalytic converter is overheating, i would definitely get it checked out. I didnt and had to replace the converter.
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Old 04-29-2004, 07:48 PM   #3 (permalink)
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Its real common with alot of the 5 series.. personally mine has been on around 2 years (says the previous owner, ive only had it for almost a 2 weeks =P). Try changing your oxygen sensor as that is what my belief mine needs.
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Old 04-30-2004, 11:18 AM   #4 (permalink)
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It usually starts as a bad O2 sensor and then progresses into a new cat. If the O2 is bad the engine management system goes into a "limp" mode which provides a constant mixture that is fuel rich. Some of this unburned fuel makes it to the Cat where it starts to build up carbon deposits which leads to overheating and failure of the cat. Autozone will now read codes on cars for free so if you have one nearby it may be worth it to stop in and have the code read to find out exactly what is wrong.
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Old 05-01-2004, 03:52 PM   #5 (permalink)
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Thanks. I tried autozone and they told me they won't touch anything before 1996. Any other known places that can check for me, other than a BMW dealer? Also, the manual says there is a method of using the accelerator to check. Does anyone know how?
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Old 05-02-2004, 11:28 PM   #6 (permalink)
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well, the problem with mine, of course i have a 85 though. but my 528e had a check control area with all the little lights taht'd go off if something is messed up. if u have that, then of course check that. but most of the cars before 1996 didn't have the high tech stuff they do now. most of the check engine lights are just linked to 02 sensors. if its like mine, its rite under ur 6th cylinder spark plug and on the exhaust manifold. take it off, if its black then yeah thats prolly it. but if not then im not sure. but check that and if its bad. go to AUtozone and get the bosch Universal ones. there only about 25 bucks and u can splice them to work as good as the 60 dollars one thats made for ur car. thats what i did and its perfect!
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Old 05-03-2004, 07:57 AM   #7 (permalink)
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Originally posted by M5power@May 3 2004, 12:08 AM
well, the problem with mine, of course i have a 85 though. but my 528e had a check control area with all the little lights taht'd go off if something is messed up. if u have that, then of course check that. but most of the cars before 1996 didn't have the high tech stuff they do now. most of the check engine lights are just linked to 02 sensors. if its like mine, its rite under ur 6th cylinder spark plug and on the exhaust manifold. take it off, if its black then yeah thats prolly it. but if not then im not sure. but check that and if its bad. go to AUtozone and get the bosch Universal ones. there only about 25 bucks and u can splice them to work as good as the 60 dollars one thats made for ur car. thats what i did and its perfect!
hey can you tell me how to check the o2 sensor? i'm not sure if i understand how to do it. and how hard is it to replace for someone who doesn't have a lot of experience under the hood? thanks for the help!

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Old 05-04-2004, 12:25 AM   #8 (permalink)
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ohh its not hard, i think the size is either 13 or 12? can't remember exactally but just get the wrench set out and find the right size, just loosen it and pull it out of ur exhaust manifold. If it looks black on the top then the carbon has gotten to it and u need to replace it. if it isn't black on top and just gold, then it should be fine, u can always just check the connections. If it hasn't ever been replaced then its probably that its bad. if its bad, follow the wires and it should disconnect from a pull out area that goes to ur firewall. ok, so if its broken what u do, is disconnect it and go to a place like Autozone, get the Bosch Universal O2 sensor, it works the same but with half the price
after tahts done, just cut the old wire off your old 02 sensor so u can reconnect it and then strip the wire, and tie the 2 wires together and cover with electrical tape, then replug it in and wrench it back into ur exhaust manifold.
Now, if u can't find it anywhere, it should be real easy. its on ur exhaust manifold, mine was under the 6th cylinder spark plug near the back when it goes under the firewall of ur engine bay. just search through it(if u feel with ur hands, make sure its not hot ) but anyways, u'll see a little pole like thing poking out of the Exhaust manifold, that'll be ur O2 sensor. SOME cars have more then one, but i doubt u will. if u have any other questions lemme know!
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Old 05-17-2004, 12:27 PM   #9 (permalink)
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where did you buy the o2 sensor from? i can't find the $25 price for it anywhere. thanks for the help!
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