20 Most Recent 2003 BMW 330 Questions & Answers

On this website you find fuse box diagram and description


2003 BMW 330 | Answered on Nov 11, 2018

The fact that you were able to repeatedly restart the engine after it shut down indicates that the battery was not totally dead and therefore the alternator is most likely to be OK. First thing I would do is take take it to have the diagnostic trouble codes read (Autozone used to do this sort of thing for free)

2003 BMW 330 | Answered on Mar 01, 2017

It is hard to be sure without checking, BMW changed from the M52B28 engine to the M52B28TU engine around that time. Enter the last 7 numbers of the VIN here to verify: http://www.bimmer.work
Find out more about the M52 engines here: https://en.wikipedia.org/wiki/BMW_M52
I recommend that you pursue your BMW questions at Bimmerforums.com. It's free and has been a fantastic resource for me over the years. Bimmerfest.com is also free and another excellent BMW resource.

2003 BMW 330 | Answered on Dec 05, 2015

the overhauler of the engine didn't finish job. pcm probably.

2003 BMW 330 | Answered on Feb 28, 2015

to access the windscreen bottle, you have to take off the front wheel, wheelarch and dicconnect filler tube. Using 10 mm socket take off one bolt holding the bottle. To reinstall take off side indicator to make it easy for you.
for E90 model it is normal to have leak when the bottle is full. the water is coming out from breather on top of bottle. but if the fluid is complately drain, then there's something wrong with it.

2003 BMW 330 | Answered on Nov 08, 2014

Power steering systems are usually either electric or hydraulic, is there a puddle of oily stuff under the car or signs of it around the engine bay? Look for a cap under the bonnet (hood) with a steering wheel symbol on and check the fluid level, if topping it up fixes it then check carefully for leaks. If you can't find either of these check for a blown fuse or loose conection.

2003 BMW 330 | Answered on Aug 12, 2014

Check the coldstart sensor/valve.
Check the injectors, one or more are maybe leaking...

2003 BMW 330 | Answered on Jul 07, 2014

You don't HAVE to put premium fuel in your car, but the maunfacturer's specifications call for it. Therefore, you will get the OPTIMAL power and OPTIMAL fuel efficiency if you follow factory specifications. Premium fuel really isn't that much more expensive. For a regular fuel cost of $2.51 and a 15gal tank its $37.65 to fill up. For premium cost of $2.74 it's $41.10 to fill up. $3.45 a tank is an EXTREMELY small price to pay for better fuel efficiency and power. Besides the better MPG will make up for the rise in price.

2003 BMW 330 | Answered on Jul 04, 2014

No fuel or No sparks...
Can you hear the electric fuel pump run when you start over?
If not, check if the pump recieves power or if filter/hoses are clogged.
Jump power directly to the fuel pump to test the circuit and pump...

2003 BMW 330 | Answered on Jun 15, 2014

im an automotive electronic rebuilder and this sounds like a possible engine computer issue to me... Sounds like something is losing its connection integrity when it gets warm. More info would be good. Also, id check all electrical connections (plugs and pins) in relevant areas for corrosion/oxidation. its more common then one might think

2003 BMW 330 | Answered on Jun 06, 2014

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