2002 318 i E 46
The VERY 1ST thing you need done here is to have a mechanical test gauge hooked up to the engine and verify the oil pressure is ok, then if it is replace the oil pressure sending unit on the engine. Do not drive this until you are sure the pressure is good, you can quickly burn up the bearings and ruin a very expensive engine.
SOURCE: Idle problem
I've had an Idling problem with my 1993 318i E36. First, I would suggest getting the fault codes for your car. There are places where you can have these codes scanned for free such as autoparts stores. The fault codes will tell you which components aren't working properly. Based on my fault codes, I replaced the Idle Control Valve, the oxygen sensor, the camshaft position sensor, and the air intake boot. I could easily install all of these parts in less than an hour. All of these replacements cost me a total of about $200 and solved the problem completely. Granted, I did this myself. Look forward to the dealer charging you over $500 if you have as many problems as I did.
SOURCE: bmw 318i e46 idle bad
try disconnecting the air mass meter sensor if it runs better then ur air mass meter has failed had the same problem
SOURCE: reset the wheel sensors on BMW e46
If you took this in and had BMW do the work to fix it and it is not fixed why do you not return to BMW and get it fixed, If you have paid for a repair and the repair did not solve the problem have them refund your money.
SOURCE: bmw 318i se e46 airbag light on
you need the scanner to diagnose this problam if no scanner needed then it will be on http://www.vehix411.com all for free how to diagnose the airbag all in video and also how to reset it without a computer cheak it out it might help you
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