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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 06-16-2016, 11:27 PM   #1
2003silver330i
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Pre Cat Fuel Trim System Cyl #4-6 SES code

Can anyone tell me what this code means. The code started appearing randomly 6 months ago and since the summer heat is upon us it comes on every day now and randomly shuts off throughout the day but mostly stays on. So if someone would be kind enough to break down the meaning of this generic code I would really appreciate it.
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Last edited by 2003silver330i; 06-16-2016 at 11:29 PM.
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Old 06-17-2016, 01:50 AM   #2
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Post Freeze Frame info.

More than likely vacuum leaks due to split/cracked hoses or vacuum caps on the rear of the intake, power brake booster leaking vacuum, but it could be a DISA leak or even a fuel pump problem.

More data is needed.
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Lower hose temp switch O-ring - BMW #13621743299
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Old 06-18-2016, 11:17 AM   #3
2003silver330i
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The O2 sensors have 156K miles on them. I'm going to swap them around and see if it follows the sensor to eliminate the potential that it is bad.
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Old 06-19-2016, 07:57 AM   #4
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Quote:
Originally Posted by 2003silver330i View Post
The O2 sensors have 156K miles on them. I'm going to swap them around and see if it follows the sensor to eliminate the potential that it is bad.

Yikes! O2 sensors are good for 100k miles. The pre-cat sensors needs to be replaced before anything else is done. Have fun removing the old sensors!!!! It'll be a real PITA!
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Old 06-19-2016, 10:18 AM   #5
2003silver330i
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I'm assuming they have that many miles but I am not the original owner by a long shot.
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Old 06-19-2016, 04:09 PM   #6
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Usually with vehicles, more owners = less maintenance.

There is a reason many people sell their cars, they do not want to spend money on repairs or maintenance.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 06-21-2016, 08:02 PM   #7
2003silver330i
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Originally Posted by jfoj View Post
Usually with vehicles, more owners = less maintenance.

There is a reason many people sell their cars, they do not want to spend money on repairs or maintenance.
And that is why I am assuming they are way over due for changing.
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Old Yesterday, 11:12 PM   #8
2003silver330i
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Update: New pre-cat O2 sensor fixed this code.
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