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Old 11-03-2012, 11:42 AM   #1
jcn330
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Join Date: Oct 2009
Location: Louisiana
Posts: 13
My Ride: 2003 330I Sport/p
Deviation Rich Code Questions

MY SES light keeps coming on, and I have a PA Soft 1.4 tool. The only code I am getting is "E4[228] Oxygen Sensor Controller Bank 2 Deviation too great, deviation rich". When I scan if the car is running the fault shows as not currently present(yellow box), and if it is just in the on position it shows the fault as currently present (red box). There are no other known symptoms to report. Idle is smooth, power is fine, fuel economy is normal. I have searched through many threads looking for my situation, however every time I come across someone who has this code it always seems to be accompanied by several other codes or multiple symptoms that I do not have. The code will only throw when the car is good and warmed up, such as driving for over an hour and half, or multiple trips in succession with little or no cool down time. My car is a 2003 330I with 86000 miles, completely stock. I have owned it for two years and 20,000 miles. I just did an oil change and air filter replacement, along with a front brake job. the car wad dealer maintained prior to my ownership. Thanks in advance for your replies.
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Old 11-03-2012, 11:57 AM   #2
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 9,340
My Ride: '06 330CiC, '03 M5
You are running lean in Bank #2 (cylinders 4-6). Most likely a small vacuum leak of some sort? There are a few vacuum ports on the bottom rear of the intake that could be the culprit.

Not a big enough delta to trigger lean codes P0174.

If you had a tool to read the fuel trim deviation you would likely see the fuel trim is over 3% and under 10%.

Suggest you read the first 2 links below in my signature for starters.
__________________
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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 01-18-2013, 03:37 PM   #3
jcn330
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Join Date: Oct 2009
Location: Louisiana
Posts: 13
My Ride: 2003 330I Sport/p
Update: I tried to find a vac leak and was unsuccessful. Then one day my car started idling really rough and had a constant ses light. It ended up being my disa valve who's flap had come unhinged inside the intake. I replaced the part and no Ses light for a few weeks now, so looks like that may have been the problem all along.
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Old 01-18-2013, 03:49 PM   #4
WDE46
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Quote:
Originally Posted by jcn330 View Post
Update: I tried to find a vac leak and was unsuccessful. Then one day my car started idling really rough and had a constant ses light. It ended up being my disa valve who's flap had come unhinged inside the intake. I replaced the part and no Ses light for a few weeks now, so looks like that may have been the problem all along.
The DISA O-ring probably had a leak as well.
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