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Old 01-22-2008, 11:10 PM   #1
dbaier
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1996 SL2
Default Heated four-wire sensor oxygen sensor

I have 1996 SL2 and I am trying to remove the heated four-wire oxygen sensor just after the CC. My special socket with a slit in it wont fit on it with the metal sheild around it. Any one with instructions or tips for removal would be nice. Also some suggestions on unplugging the connection would be helpfull. Thanks.

...
-Dave


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Old 01-23-2008, 02:00 AM   #2
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Default Re: Heated four-wire sensor oxygen sensor

vice grips (big pair of pliers) works great.

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Old 01-23-2008, 04:34 AM   #3
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1996 SL2
Default Re: Heated four-wire sensor oxygen sensor

Quote:
Originally Posted by dbaier View Post
I have 1996 SL2 and I am trying to remove the heated four-wire oxygen sensor just after the CC. My special socket with a slit in it wont fit on it with the metal sheild around it. Any one with instructions or tips for removal would be nice. Also some suggestions on unplugging the connection would be helpfull. Thanks.
Were you getting a code saying this sensor was bad?

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Old 01-23-2008, 06:59 AM   #4
dbaier
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Default Re: Heated four-wire sensor oxygen sensor

Autozone ran the code for me PO141, is what came up. "Heated oxygen sensor".

...
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1999 SC1 100,000

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1996 SL2 222,000
SOLD to a nice family that needed a car.

1999 SL 184,000
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Old 01-23-2008, 07:48 AM   #5
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Default Re: Heated four-wire sensor oxygen sensor

Quote:
Originally Posted by dbaier View Post
Autozone ran the code for me PO141, is what came up. "Heated oxygen sensor".
you might want to double check that... usually, the rear heated o2 sensor will outlive the cat. it's possible that the sensor's throwing a code because the cat finally went bad. happened to me about a month ago...

if it really is the sensor, you'll have to put the torch to it to get it out...


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Old 01-23-2008, 08:46 AM   #6
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Default Re: Heated four-wire sensor oxygen sensor

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Originally Posted by S3aturnR View Post
if it really is the sensor, you'll have to put the torch to it to get it out...
I've gotten a couple out by cutting the wires and using a box end wrench. Of course, I don't live where road salt's a problem.

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Old 01-23-2008, 08:46 AM   #7
dbaier
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Default Re: Heated four-wire sensor oxygen sensor

How do I double check it? Have it re-read at Autozone?

...
-Dave


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1999 SC1 100,000

Kids car
1996 SL2 222,000
SOLD to a nice family that needed a car.

1999 SL 184,000
RIP

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Old 01-23-2008, 09:00 AM   #8
DonP
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Default Re: Heated four-wire sensor oxygen sensor

P0141 = Rear O2 Heater Circuit Malfunction.
This DTC determines if the O2 sensor heater is functioning by monitoring the amount of time necessary for the O2 sensor to become active after ignition key-up.

Were there any other codes? This could be set as a secondary indication by several other conditions as wel (not the least of which is an ECTS problem), but most of them should give their own codes too.

One check would be to see if there is current going to the O2 sensor heater, but that may not be an easy check for most folks.

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Old 01-23-2008, 11:59 AM   #9
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1996 SW2
Default Re: Heated four-wire sensor oxygen sensor

Vise-grip or box wrench won't fit with the guard around the sensor; dunno why anyone would suggest that.

There's also a crow's-foot-style O2 sensor socket, which works within that guard. If you have a 1/2" "wobble" adaptor or socket extension, that might work with your existing slotted socket. I was able to fit one on mine (repeated P0137s), but the sensor was so fused by rust and heat that the slot on the socket just opened and made the socket "jump" when I leaned on it. I was sensing the power was weak anyway, and had ruled out everything upstream, and the exhaust pressure at the tailpipe felt weak, so I punted and bought a new cat, threaded a new sensor into it, and was done with it.

If you're pretty sure your cat is good, yes, the sensor can go, and a 137 or 141 or the like can mean just a bad sensor. Try one of the above wrench setups, give it several daily doses of PB Blaster, heat it up by running the engine up to temp, and say a quick prayer to St. Rusty.

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Old 01-23-2008, 12:07 PM   #10
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Default Re: Heated four-wire sensor oxygen sensor

Quote:
Originally Posted by madpogue View Post
Vise-grip or box wrench won't fit with the guard around the sensor; dunno why anyone would suggest that.
Have you actually tried a box end wrench? Because I've done it with a box end wrench. There's enough room even with the guard. You just have to cut the wires and it works fine. Of course you can't use that method going back on. For that I use the tool you describe but, a box end wrench can take more torque when that tool just isn't enough. I'll agree that the guard is to close for vice grips.

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Old 01-23-2008, 12:10 PM   #11
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Default Re: Heated four-wire sensor oxygen sensor

Actually, I didn't try the box-end; didn't want to cut the wires. This would be a good case for a six-point box wrench (alas, my set was stolen).

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Old 01-26-2008, 12:25 PM   #12
dbaier
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Default Re: Heated four-wire sensor oxygen sensor

Issue solved, took my car to the local muffler shop. They confirmed the code, removed the old sensor, put the new one in and cleared the code for $25. I though that was well worth my money. 200 miles later car runs much better and no check engine light glowing on the dash.....

...
-Dave


Current DD
1999 SC1 100,000

Kids car
1996 SL2 222,000
SOLD to a nice family that needed a car.

1999 SL 184,000
RIP

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Old 01-26-2008, 12:48 PM   #13
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Default Re: Heated four-wire sensor oxygen sensor

Quote:
Originally Posted by dbaier View Post
Issue solved, took my car to the local muffler shop. They confirmed the code, removed the old sensor, put the new one in and cleared the code for $25. I though that was well worth my money.
You have a flair for understatement! If it's okay to ask, where in WI was this? It's been my experience that even the most reputable shops will do "free inspections", with the prospect of making money from a service, but anything beyond that, if it involves putting a car on a lift, it's $50 labor minimum.

'Course, I'm also curious as to what sort of mojo they used to remove a Wisconsin-welded (rusted) sensor so readily.

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Old 01-26-2008, 03:45 PM   #14
dbaier
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Default Re: Heated four-wire sensor oxygen sensor

A few notes about this. I went to NAPA bought the part, pulled the car up on the ramps, couldn't get enough leverage. I Called around found a place the would swap it out, no problem. I spoke to the guy that did it, and he said "it was one of the easier ones he has done". He test drove it and the code cleared it's self.

...
-Dave


Current DD
1999 SC1 100,000

Kids car
1996 SL2 222,000
SOLD to a nice family that needed a car.

1999 SL 184,000
RIP

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