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Re: 1999 750il problems (archive)

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Posted by John Wong 95 750il/'86M635 on April 22, 2002 at 09:51:47:

In Reply to: Re: 1999 750il problems posted by Carfixerdo on April 19, 2002 at 19:08:55:

My local NJ AutoZone will plug into the car OBD II interface, read the fault code and reset indicators for free. But they were too busy, so I bought the $150.00 reader and did it myself.
The problem is BMW has its own codes that the dealer says is not cross referenced to the standard codes that the reader provides.
Still trying to find the cross reference. If any one has it, please post for all.

I have owned my 1999 750il for about 3 months now, love it.

But, it has been in to the dealer 4 times (under warrenty) for a "Service Engine Soon" light. I am very tired of not having my car.

1)Dealer gets car with "Service Engine Soon" light is on
2)They say they fix it (see below)
3)I get car back w/o "Service Engine Soon" light on
4)a day later light comes back on.

They have replace: 1) an O2 sensor
2) a ground cable to the cat covert.
3) battery disconect fuse
(disconects battery in accident)

Don't ask me what else that have done, but they have not fixed it... that f**king light is on again. My wife wants me to sell the car calling it a lemon (hell will freeze over first).

Any ideas anyone? Should I try a different dealer (Los Angeles area)?


I think the best thing you can do for yourself is to purchase an OBDII tester (cost about $150.00). This will tell you why the engine light is on. This plugs into the ADL socket inside the car next to the front cup holders. This can then give you an idea if the dealer is heading in the right direction. The dealer should be doing this themselves but it sounds like they are missing something. There are more expensive OBDII testers but an inexpensive one like this should help you have an idea before someone starts to work on your car. The light coming on can be just about anything. For some reason people think that once the light comes on it has to do with the O2 sensor. This is not always the case as you found out. Also, your vehicle has 4 O2 sensors. If they ran the computer and truly found that the O2 sensor is bad hopefully they changed the correct one. I know we were doing a 740iL and changed the wrong one. We just were not paying attention and changed the passenger front instead of the driver front. The computer told us it was the passenger side but a mental lapse led to the wrong one being changed. Once we finished we cleared the codes from the computer. The light will take about a day for it to come back on and sure enough that is what happened. We ended up changing both and only charged for one because of our error. It happens.

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