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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 04-18-2013, 11:39 AM
crichey6559 crichey6559 is offline
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Location: Madison, AL
 
Join Date: Apr 2013
Posts: 1
Mein Auto: 1998 BMW 540i
98 540i issues

I'm currently getting 3 error codes.
p0304
p0204
p0443
I think. My OBDII scanner won't show me anything once unplugged.
I know what all 3 codes mean but I had these codes a few days ago and have replaced injector number 4 with a brand new one. The wiring and everything looked good when I replaced it. The car only has 99k on it.
Does anyone have any ideas why these code would return after replacing the injector?
I could understand if one of them returned it could be the coil or spark plug but I'm still getting the code for a bad injector when I replaced it yesterday. The car ran fine for the rest of the day but when I cranked it today it is giving me the same errors I had at the start.

Any help would be appreciated. I bought this car just over a week ago and don't mind working on it but replacing something and then getting the same error 2 days later is annoying.
FYI yes I cleared the codes, the first 2 stayed gone yesterday and then returned today.
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