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Old 07-03-2017, 01:34 PM   #1
Carlosss_
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Help with CEL for O2 sensors (LOGS INCLUDED)

Hey guys, I have a 2004 BMW 325i with 94K Miles. It threw codes P2097, P2098, and P2270 so I replaced the intake rubber boots and cleared the code but to my surprise they returned.

All the codes that I'm getting are for post O2 sensors, Bank 1 says its signal is stuck lean but also that the fuel trim is too rich. How would this be ?
Bank 2 is just reporting fuel trim too lean.

I have ran diagnostics report on OBDFusion(which I will attach), but I just don't necessarily know what I'm looking for. I'm thinking I have a vacuum leak somewhere in the system and it's trying to compensate for it by throwing more fuel but then wouldn't my precat o2 sensors detect that and throw a code for the vacuum leak?

I'm attaching all the Logs and Diagnostic reports that would be required(read on jfoj pdf guide). If there's anymore info I can provide, please let me know.

Any help is appreciated!
Thank you!

(PRE_DIAGNOSTIC)-https://www.dropbox.com/s/az57ebp9nk...6-23.html?dl=0

(HIGWAY_RUN_CSVLOG)-https://www.dropbox.com/s/xe0rluq5wa...51218.csv?dl=0

(AFTER_HIGHWAY_RUN_DIAGNOSTIC)-https://www.dropbox.com/s/ckcsl5rsw6...6-23.html?dl=0

(4_MINUTE_IDLE)-https://www.dropbox.com/s/039v78dnzx...45052.csv?dl=0

(COLD_START_CSVLOG)-https://www.dropbox.com/s/m614hlh9vm...30705.csv?dl=0

(COLD_START_DIAGNOSTIC_REPORT)-https://www.dropbox.com/s/u5gwikh2mn...6-27.html?dl=0

Last edited by Carlosss_; 07-03-2017 at 01:36 PM.
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Old 07-04-2017, 08:14 AM   #2
markusmarkus
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Are the sensors original? The pre-cat sensors need to be replaced every ~100k miles as they are considered maintenance items similar to brake pads. If they are original I'd change them first. Amazon has great prices on Bosch sensors. BUY ONLY BOSCH O2 SENSORS!

Make sure you label the O2 sensor harnesses as mixing them up will have you chasing your tail!!
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Old 07-05-2017, 03:13 PM   #3
Carlosss_
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Okay, I could probably get OEM ones. But why wouldn't it be throwing codes for the precat o2s? And what about the signal stuck lean code?

Regardless, I'll probably replace the precats just for maintenance now.
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Old 07-10-2017, 03:42 PM   #4
Carlosss_
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Anyone?
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Old 07-12-2017, 04:54 PM   #5
Carlosss_
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Bump
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Old 07-12-2017, 05:21 PM   #6
jfoj
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Carlosss,

I will try to take a look at things a bit later this evening, I was out of the country for a week and recently returned and missed this post.
__________________
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 07-12-2017, 06:11 PM   #7
jfoj
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Quick look at the data, the MAF value is very low at idle, this is probably why the Fuel Trims are so high.

The question is the MAF bad or are the vacuum leaks causing the MAF to under report due to air bypassing the MAF?

Smoke testing will find the air leaks very quickly.

See this thread: Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616
__________________
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 07-16-2017, 07:39 PM   #8
Carlosss_
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@jfoj I'd been busy this week and hadn't had time to check the thread again but thank you for reporting back to me! Would the vacuum leak have to be before the MAF or it could just be anywhere in the system and then the MAF still under report? If it's after the MAF then its probably my CCV since I have not changed it and I doubt the owner before me replaced it either.

Ill look and see who can smoke test it and see what comes out. The vacuum leak would still be responsible for the codes for the O2 sensors staying "stuck lean" though?

Thanks
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Old 07-16-2017, 08:40 PM   #9
jfoj
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The low MAF reading could be due to a vacuum leak AFTER the MAF. Could be in the intake air path, CCV system or hoses, crankcase (cracked valve cover, leaking oil fill cap, dipstick O-rings flattened), Power Brake Booster, DISA O-ring.

So until you can rule out vacuum leaks, then this is the first step I would focus on. No since on replacing the MAF if the problem is due to vacuum leaks.

Vacuum leaks and/or a low MAF reading can cause the O2 sensors to be stuck reading a Lean condition that the DME cannot compensate for.
__________________
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 07-17-2017, 11:50 AM   #10
Carlosss_
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@jfoj Ah gotcha, I will be smoke testing it then and seeing where the leaks are!
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