rear o2 sensor stuck on downpipes

Secret_Squirrel · 04-08-2014, 04:17 PM

So I'm getting my ar downpipes installed and the shop calls me and says they couldn't get one of the o2 sensors off from the rear of the stock downpipes. Car has 40k miles. Shop says it's baked on and I need a new one. Hard to believe that it can be baked on with just 40k. What do you guys think?

blackbeast06 · 04-08-2014, 05:01 PM

Take it to another shop! For real though they should try to take it out until it breaks. Or they already broke it and are just saying that they cannot get it out, then they don't have to pay for a new one.

AK 335i · 04-08-2014, 05:06 PM

lol

Ingeniator · 04-08-2014, 05:33 PM

They broke it reinstalled and torqued the sit out of it. If not the right amount of heat with a rosebud will get it out. Sounds like a sketchy shop.

Jeff@TopGearSolutions · 04-08-2014, 05:37 PM

I've experienced those o2 sensors first hand and some cars did take quite a bit of force to get them off, my own personal car gave me hell for about 30 minutes as I was in fear of breaking it off. I was literally putting my entire body weight into the wrench and it wasn't budging and clearance was an issue.

If they don't have an o2 sensor socket I would try one of those first as that will surely get it off in the most correct fashion.

If they are using an open ended wrench that could be a concern but sometimes you need that extra leverage they provide.

Secret_Squirrel · 04-08-2014, 07:23 PM

Thanks for the info guys. The owner said he tried the best he could but it wouldn't budge. Its still connected to the old downpipes. He said if I can get it off without messing up the treads then I can bring it in and he'll install it, no charge. Or I buy a new one and he'll also install it no charge. Gonna try another shop and see if they can get it off.

pwr hungry · 04-08-2014, 07:37 PM

My primary rear O2 stripped on me and I hate to cut it in half and drill it out to remove it. So, they are likely telling the truth.

MDORPHN · 04-08-2014, 08:19 PM

Soak it overnight in some PB Blaster. If that doesn't do it, try heat.

Neil

Secret_Squirrel · 04-09-2014, 09:51 AM

Quote:

Originally Posted by MDORPHN

Soak it overnight in some PB Blaster. If that doesn't do it, try heat.

Neil

Thanks Neil it worked. Pb blaster FTW!!

Mike@N54Tuning.com · 04-09-2014, 10:08 AM

Quote:

Originally Posted by Secret_Squirrel

So I'm getting my ar downpipes installed and the shop calls me and says they couldn't get one of the o2 sensors off from the rear of the stock downpipes. Car has 40k miles. Shop says it's baked on and I need a new one. Hard to believe that it can be baked on with just 40k. What do you guys think?

I've never heard of that in all my years. They can be difficult but I have never had someone email about this issue. Did they try soaking it with some spray for 15-20 minutes too help?

Mike

MDORPHN · 04-09-2014, 10:49 AM

Quote:

Originally Posted by Secret_Squirrel

Thanks Neil it worked. Pb blaster FTW!!

Excellent!

Neil

Tiago@VRSF · 04-09-2014, 11:14 AM

Heat and a bigger wrench will generally do the trick but one should always spray PB Blaster on any corroded part that you're taking a wrench to.

Secret_Squirrel · 04-09-2014, 01:19 PM

Quote:

Originally Posted by Mike@N54Tuning.com

I've never heard of that in all my years. They can be difficult but I have never had someone email about this issue. Did they try soaking it with some spray for 15-20 minutes too help?

Mike

Not sure but I did soak it this morning and let it sit for an hour.
It still took 5 minutes with a wrench then it Finally gave.
Maybe they didn't soak it long enough

Mike@N54Tuning.com · 04-09-2014, 01:53 PM

Quote:

Originally Posted by Secret_Squirrel

Not sure but I did soak it this morning and let it sit for an hour.
It still took 5 minutes with a wrench then it Finally gave.
Maybe they didn't soak it long enough

Ya maybe.. I am really surprised a shop couldn't get it off. A DIY guys I can understand, but a shop with all their tools... kinda hard to believe. Like Tiago mentioned mild heat is another great way to get it off.

Mike

Secret_Squirrel · 04-09-2014, 02:25 PM

Quote:

Originally Posted by Mike@N54Tuning.com

Ya maybe.. I am really surprised a shop couldn't get it off. A DIY guys I can understand, but a shop with all their tools... kinda hard to believe. Like Tiago mentioned mild heat is another great way to get it off.

Mike

Yeah hard to understand but it's off. Now I just need them to
adjust my downpipes. I'm getting vibration inside the car when
it's in park or not under acceleration. Plus , finally
Hearing the police siren sound from the turbo .. haha . All fun stuff.

04-08-2014, 04:17 PM	#1
Secret_Squirrel Second Lieutenant 23 Rep 282 Posts Drives: Tiag 09 335xi Join Date: Apr 2012 Location: Chicago iTrader: (4)	rear o2 sensor stuck on downpipes So I'm getting my ar downpipes installed and the shop calls me and says they couldn't get one of the o2 sensors off from the rear of the stock downpipes. Car has 40k miles. Shop says it's baked on and I need a new one. Hard to believe that it can be baked on with just 40k. What do you guys think?
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04-08-2014, 05:01 PM	#2
blackbeast06 adrenergic stimulation 45 Rep 405 Posts Drives: 2019 M4cs San Marino Blue Join Date: Dec 2009 Location: Columbus iTrader: (4) Garage List 2006 325i [0.00]	Take it to another shop! For real though they should try to take it out until it breaks. Or they already broke it and are just saying that they cannot get it out, then they don't have to pay for a new one. __________________ 2015 M4 Mineral White/Sakhir Orange 6MT Retired 2007 335i Montego Blue/Saddle Brown 6 MT Retired 2006 325i Black/Black 6MT [IMG]m4 by senntera, on Flickr[/IMG]
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04-08-2014, 05:06 PM	#3
AK 335i Major 48 Rep 1,290 Posts Drives: black 335i E90 Join Date: Sep 2012 Location: boynton beach iTrader: (0)	lol __________________ - Proven Power Tampa Built 6466 ST N54 6AT WR 711whp 637wtq -
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04-08-2014, 05:33 PM	#4
Ingeniator Major 34 Rep 1,093 Posts Drives: 07 335XI(90) 09 135I(82) Join Date: Nov 2013 Location: Fort Mac, Alberta iTrader: (1)	They broke it reinstalled and torqued the sit out of it. If not the right amount of heat with a rosebud will get it out. Sounds like a sketchy shop. __________________ 07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's 09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system
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04-08-2014, 05:37 PM	#5
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	I've experienced those o2 sensors first hand and some cars did take quite a bit of force to get them off, my own personal car gave me hell for about 30 minutes as I was in fear of breaking it off. I was literally putting my entire body weight into the wrench and it wasn't budging and clearance was an issue. If they don't have an o2 sensor socket I would try one of those first as that will surely get it off in the most correct fashion. If they are using an open ended wrench that could be a concern but sometimes you need that extra leverage they provide.
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04-08-2014, 07:23 PM	#6
Secret_Squirrel Second Lieutenant 23 Rep 282 Posts Drives: Tiag 09 335xi Join Date: Apr 2012 Location: Chicago iTrader: (4)	Thanks for the info guys. The owner said he tried the best he could but it wouldn't budge. Its still connected to the old downpipes. He said if I can get it off without messing up the treads then I can bring it in and he'll install it, no charge. Or I buy a new one and he'll also install it no charge. Gonna try another shop and see if they can get it off.
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04-08-2014, 07:37 PM	#7
pwr hungry Banned 41 Rep 1,257 Posts Drives: 335 Join Date: Mar 2013 Location: Amer'ca iTrader: (2)	My primary rear O2 stripped on me and I hate to cut it in half and drill it out to remove it. So, they are likely telling the truth.
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04-08-2014, 08:19 PM	#8
MDORPHN Colonel 292 Rep 2,898 Posts Drives: AW 1M Join Date: Oct 2010 Location: Wash, DC iTrader: (0)	Soak it overnight in some PB Blaster. If that doesn't do it, try heat. Neil
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04-09-2014, 11:14 AM	#12
Tiago@VRSF 2095 Rep 43,350 Posts Drives: F90 M5 Join Date: Dec 2007 Location: Doral, FL iTrader: (99) Garage List 2014 F30 328xi [0.00] 2015 F82 BMW M4 [0.00] 2013 Ducati 1199 Pa ... [0.00] 2008 BMW 335i [0.00]	Heat and a bigger wrench will generally do the trick but one should always spray PB Blaster on any corroded part that you're taking a wrench to.
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