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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 07-08-2009, 10:23 AM   #1 (permalink)
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Exclamation HELP! 328i is throwing 3 codes!

When I went to get my car inspected the mechanic told me that my check engine light doesn't come on when i start the car like it should.

Along with that he said my car is throwing 3 codes...

P0173
Fuel Trim Malfunction (Bank 2)

P1423
P1421
Manufacturer Control Auxiliar Emission Controls

Can anyone help me out!!!???
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Old 07-08-2009, 10:47 AM   #2 (permalink)
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P0173 Bank 2, I wouldnt worry about this one unless you have dropped a V8 in as you only have Bank1. As for the other two codes Im not sure, I will have a look in my files.
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Old 07-08-2009, 10:52 AM   #3 (permalink)
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P1421 : secondary air system Bank 1, found this:

How-To: Replace Your Secondary Air Pump (1996-up E36 6-cylinder cars) - Bimmerforums - The Ultimate BMW Forum

and this:

BMW check engine light????? - Yahoo! Answers

So your light should be on, I would get him to clear the codes do 50 miles and get them read again as it may have been done and the codes not cleared.
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Old 07-08-2009, 11:22 AM   #4 (permalink)
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Previous owner did drop in a replacement engine....could that be why its throwing those codes? and you think a reset of codes might clear it all up?

As for the check engine light, my brake light went out so the "Check Control" light came on next to my gauges. Is that the only check engine light next to my gauges?
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Old 07-08-2009, 11:40 AM   #5 (permalink)
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Resetting the codes will clear them from the ECU and if the error is still there after a 50 mile drive they will reapper and you will have to take care of what ever is wrong.

check engine light, Im not sure on your model, do a google search or another member may be able to shed some light on the subject, you could always google search for a downloadable owners manual.
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