Service engine soon o2 sensor problem

Sam12345 · 02-18-2009, 01:24 AM

Ok my mods are catless downpipes, jb3, RR o2 sim and RR intake.

I was getting this SES light coming on and off for about 1 week, then it stayed on steadily for a solid week. Got the code read and its p0140 (Bank 1 sensor 2, O2 sensor circuit no activity deteced).

Basically i then took off my previous jb2 awaiting for my jb3. The code went away when i didnt have a chip in my engine. Ran a couple days without the JB and the code finally came back! ughhh.

So i installed JB3 and code is still here, is this damaging my car severly?

Probably getting it fixed within the next couple days. Just wondering if i could be giving myself some serious problems.
No colored smoke from the exhaust(not running lean or rich).

I have been driving the car quite hard out of excitment for the jb3...

Sam12345 · 02-18-2009, 08:15 PM

bump, does anyone know if Bank 1 sensor 2 is precat or after cat?

Malek@MRF · 02-18-2009, 08:18 PM

Bank 1 sensor 2 means POST cat. Your 02 sim is not working properly Sam.

scalbert · 02-18-2009, 08:19 PM

B1S2 is post cat

Sam12345 · 02-18-2009, 08:36 PM

thanks guys, so its not really important to fix it i guess

scalbert · 02-18-2009, 08:37 PM

Quote:

Originally Posted by Sam12345

thanks guys, so its not really important to fix it i guess

Not being able to pass emissions would be reason enough to fix it.

Sam12345 · 02-18-2009, 08:39 PM

lol with catless downpipes i doubt i will pass emissions regardless. hahaha.

Do you think its actually o2 sensor broken or just the downpipe fix sim?

scalbert · 02-18-2009, 09:07 PM

Most likely the sim.

Or, check the connector. Mine was loose and caused a code. I just about replaced the sensor but when going to pull the old one I found the connectors was just loose.

02-18-2009, 01:24 AM	#1
Sam12345 Lieutenant Colonel 111 Rep 1,534 Posts Drives: jet black 335i coupe Join Date: Feb 2008 Location: So Cal iTrader: (3) Garage List 2008 335i Coupe [0.00]	Service engine soon o2 sensor problem Ok my mods are catless downpipes, jb3, RR o2 sim and RR intake. I was getting this SES light coming on and off for about 1 week, then it stayed on steadily for a solid week. Got the code read and its p0140 (Bank 1 sensor 2, O2 sensor circuit no activity deteced). Basically i then took off my previous jb2 awaiting for my jb3. The code went away when i didnt have a chip in my engine. Ran a couple days without the JB and the code finally came back! ughhh. So i installed JB3 and code is still here, is this damaging my car severly? Probably getting it fixed within the next couple days. Just wondering if i could be giving myself some serious problems. No colored smoke from the exhaust(not running lean or rich). I have been driving the car quite hard out of excitment for the jb3... __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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02-18-2009, 08:15 PM	#2
Sam12345 Lieutenant Colonel 111 Rep 1,534 Posts Drives: jet black 335i coupe Join Date: Feb 2008 Location: So Cal iTrader: (3) Garage List 2008 335i Coupe [0.00]	bump, does anyone know if Bank 1 sensor 2 is precat or after cat? __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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02-18-2009, 08:18 PM	#3
Malek@MRF Brigadier General 754 Rep 3,732 Posts Drives: E92 M3, E46 M3, G82 M4 Join Date: Jan 2008 Location: Irvine, California iTrader: (5)	Bank 1 sensor 2 means POST cat. Your 02 sim is not working properly Sam. __________________ BMW PERFORMANCE SPECIALISTS. Race Engines. Suspension. F/I. Brakes. Race Preparation. Factory Service. Alignments. OFFICIAL PARTNERS: KW. MOTON. Brembo. AP Racing. BBS Motorsport. iND. HRE. Turner Motorsport. VAC. BMW Motorsport. Facebook \| Instagram \| Yelp! \| Flikr Phone: 949-233-0448 \| E-Mail: info@mrfengineering.com
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02-18-2009, 08:19 PM	#4
scalbert Major General 161 Rep 5,776 Posts Drives: '13 S4, '15 Q7 Join Date: Feb 2007 Location: Woodstock, GA iTrader: (8)	B1S2 is post cat
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02-18-2009, 08:36 PM	#5
Sam12345 Lieutenant Colonel 111 Rep 1,534 Posts Drives: jet black 335i coupe Join Date: Feb 2008 Location: So Cal iTrader: (3) Garage List 2008 335i Coupe [0.00]	thanks guys, so its not really important to fix it i guess __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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02-18-2009, 08:39 PM	#7
Sam12345 Lieutenant Colonel 111 Rep 1,534 Posts Drives: jet black 335i coupe Join Date: Feb 2008 Location: So Cal iTrader: (3) Garage List 2008 335i Coupe [0.00]	lol with catless downpipes i doubt i will pass emissions regardless. hahaha. Do you think its actually o2 sensor broken or just the downpipe fix sim? __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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02-18-2009, 09:07 PM	#8
scalbert Major General 161 Rep 5,776 Posts Drives: '13 S4, '15 Q7 Join Date: Feb 2007 Location: Woodstock, GA iTrader: (8)	Most likely the sim. Or, check the connector. Mine was loose and caused a code. I just about replaced the sensor but when going to pull the old one I found the connectors was just loose.
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