P0139 Question, already searched.

sw0ggd0gg · 04-21-2009, 01:04 AM

I got the code p0139 with an AEM intake, buddy club rh and LSD kitty backer. I understand the code means 'slow response'. I searched and found one mention of checking the MAF. My intake was sworn by AEM not to work well with any other year but 06, I have an 08. My dyno proved the intake made power, up to 12 whp and 6 hp over max. I do have 'lumpy' problems wit this intake. Like if its got lets say 3 lines of coolant temp when im jsut heading to work and i go past half throttle any where under 3500 rpm, my face is in the steering wheel with what feels like detonation. With the stock intake its as clear as a whistle, i can mash anywhere with no problems. i had the whole setup on and never had a code till 6k miles or so, then i cleared it and got the same code another 1k later.

So im just wondering if it is the intake.

asdf · 04-21-2009, 03:56 AM

P0139 refers to the 2nd o2 sensor. Do you have a defouler?

sw0ggd0gg · 04-21-2009, 12:57 PM

yes i have an angled deofuler

asdf · 04-21-2009, 02:40 PM

How many miles on the o2? Have you checked to see if your wires are rubbing against anything or if it's shorting out?

***SiLentPower*** · 04-21-2009, 07:08 PM

More than likely the wires are shorting out. The car is also probably staying in open loop, so my guess is that the heater is bad. The code is saying the 02 sensor is intermittent. It should be the one just prior to the cat. I dont believe we have one after the cat.

8kallday · 04-21-2009, 07:35 PM

did you cut and slpice the 2nd o2 wires when you installed the header? i had to on mine but just for the sake of time and i have a code that comes up as slow response bank 1 sensor 2 but my car doesnt bog or anything i just need to get off my ass and soder the wires together lol

***SiLentPower*** · 04-21-2009, 07:40 PM

haha, yeah you gotta do it right. Sometimes the higher flow of exhaust will foul up the sensor quicker. It very well could be starting to foul up.

sw0ggd0gg · 04-22-2009, 11:22 AM

No everything went in with stock components. all wiring. I have had the defouler in sicne the header was put on. There are two 02 sensors btw. one for AFR and one for catalyst efficiency. Wehn i look at my scanner what sohuld i benn in open or closed loop.

sw0ggd0gg · 04-23-2009, 12:56 AM

im gettin this damn code now every 20-30 miles so i guess ill jsut go ahead and order a new sensor with harness.

brdhouse · 04-23-2009, 09:41 AM

Have you considered a different defouler? I think I read somewhere on here that the code *could* mean that the sensor is not getting enough of a reading from the exhaust flow, therefore the low reading nature of the code. I got the same code, as well as the "stuck rich" code (can't remember the code number), and plan to try a new, shorter angled defouler before I drop the cash on a new sensor.

Funny thing is, I can tell just before I'm going to get the cel... droning in 3-4k range gets louder and mushy sounding. It happens periodically, and eventually goes away after a few days. good luck.

***SiLentPower*** · 04-28-2009, 07:47 PM

The sound is because the computer cannot decide how much fuel it needs to inject and I would imagine it is rich as hell. check your plugs

04-21-2009, 01:04 AM	#1 (permalink)
sw0ggd0gg Senior Member Join Date: Nov 2008 Posts: 389 iTrader: 5 / 100%	P0139 Question, already searched. I got the code p0139 with an AEM intake, buddy club rh and LSD kitty backer. I understand the code means 'slow response'. I searched and found one mention of checking the MAF. My intake was sworn by AEM not to work well with any other year but 06, I have an 08. My dyno proved the intake made power, up to 12 whp and 6 hp over max. I do have 'lumpy' problems wit this intake. Like if its got lets say 3 lines of coolant temp when im jsut heading to work and i go past half throttle any where under 3500 rpm, my face is in the steering wheel with what feels like detonation. With the stock intake its as clear as a whistle, i can mash anywhere with no problems. i had the whole setup on and never had a code till 6k miles or so, then i cleared it and got the same code another 1k later. So im just wondering if it is the intake.

04-23-2009, 12:56 AM	#9 (permalink)
sw0ggd0gg Senior Member Join Date: Nov 2008 Posts: 389 iTrader: 5 / 100%	Welp im gettin this damn code now every 20-30 miles so i guess ill jsut go ahead and order a new sensor with harness.

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04-21-2009, 03:56 AM	#2 (permalink)
asdf Senior Member Join Date: Jun 2007 Posts: 3,356 iTrader: 13 / 100%	P0139 refers to the 2nd o2 sensor. Do you have a defouler?

04-21-2009, 12:57 PM	#3 (permalink)
sw0ggd0gg Senior Member Join Date: Nov 2008 Posts: 389 iTrader: 5 / 100%	yes i have an angled deofuler

04-21-2009, 02:40 PM	#4 (permalink)
asdf Senior Member Join Date: Jun 2007 Posts: 3,356 iTrader: 13 / 100%	How many miles on the o2? Have you checked to see if your wires are rubbing against anything or if it's shorting out?

04-21-2009, 07:08 PM	#5 (permalink)
*SiLentPower* Absolut Alcoholic Join Date: Apr 2007 Location: North Indy Age: 22 Posts: 390 Joe iTrader: 0 / 0%	More than likely the wires are shorting out. The car is also probably staying in open loop, so my guess is that the heater is bad. The code is saying the 02 sensor is intermittent. It should be the one just prior to the cat. I dont believe we have one after the cat.

04-21-2009, 07:35 PM	#6 (permalink)
8kallday Member Join Date: Nov 2008 Posts: 39 iTrader: 0 / 0%	did you cut and slpice the 2nd o2 wires when you installed the header? i had to on mine but just for the sake of time and i have a code that comes up as slow response bank 1 sensor 2 but my car doesnt bog or anything i just need to get off my ass and soder the wires together lol

04-21-2009, 07:40 PM	#7 (permalink)
*SiLentPower* Absolut Alcoholic Join Date: Apr 2007 Location: North Indy Age: 22 Posts: 390 Joe iTrader: 0 / 0%	haha, yeah you gotta do it right. Sometimes the higher flow of exhaust will foul up the sensor quicker. It very well could be starting to foul up.

04-22-2009, 11:22 AM	#8 (permalink)
sw0ggd0gg Senior Member Join Date: Nov 2008 Posts: 389 iTrader: 5 / 100%	No everything went in with stock components. all wiring. I have had the defouler in sicne the header was put on. There are two 02 sensors btw. one for AFR and one for catalyst efficiency. Wehn i look at my scanner what sohuld i benn in open or closed loop.

04-23-2009, 09:41 AM	#10 (permalink)
brdhouse Senior Member Join Date: Nov 2006 Location: Burnsville, MN Posts: 1,285 Bill iTrader: 5 / 100%	Have you considered a different defouler? I think I read somewhere on here that the code could mean that the sensor is not getting enough of a reading from the exhaust flow, therefore the low reading nature of the code. I got the same code, as well as the "stuck rich" code (can't remember the code number), and plan to try a new, shorter angled defouler before I drop the cash on a new sensor. Funny thing is, I can tell just before I'm going to get the cel... droning in 3-4k range gets louder and mushy sounding. It happens periodically, and eventually goes away after a few days. good luck.

04-28-2009, 07:47 PM	#11 (permalink)
*SiLentPower* Absolut Alcoholic Join Date: Apr 2007 Location: North Indy Age: 22 Posts: 390 Joe iTrader: 0 / 0%	The sound is because the computer cannot decide how much fuel it needs to inject and I would imagine it is rich as hell. check your plugs