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Old 04-15-2019, 11:55 PM   #1
J.W.
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2001 SL2
Default 02 sensor

2001 sl2... Somewhere on this net I reecently read about using a spark plug anti-foul adapter to salvage dirty 02 sensor, by cutting the shield off the sensor, screwing it into the anti-foul device, then into the exhaust.
Does this look familiar to anyone ? I did not find it on 'search'.
Thanks !

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Old 04-17-2019, 03:31 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: 02 sensor

You didn't read it here as no one here has cut off any shield on their O2 sensor then screwed in an anti fouler. at least two issues may occur - 1) the O2 sensor is rendered useless if the shield is cut off and 2)anti foulers have limited use.

What are you trying to do?

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Old 04-17-2019, 04:03 PM   #3
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2002 SC1
Default Re: 02 sensor

What you are describing is a way to trick the emission control system into thinking that a failing catalytic converter is still working. The rear O2 sensor is removed, screwed into a pair of non-foulers, one of which has been drilled out to 9/16", and reinstalled in the exhaust. This puts the sensor farther from the exhaust stream to flatten out its readings, while still letting a little exhaust interact with the sensor so it appears to the PCM to be working. The O2 sensor itself is not modified in any way.

This trick is normally a response to a P0420 code that won't go away. The correct fix is to replace the cat, but the non-fouler trick can get you through an inspection or two before the cat clogs up permanently. I did the non-fouler trick and passed 3 inspections. The cat clogged after that and I replaced it.

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Old 04-17-2019, 05:18 PM   #4
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1998 SC2
Default Re: 02 sensor

They make a slightly longer anti fouler that is available so cutting of the shield or drilling out a pair of short anti foulers is not required. This will solve a P0420 code for a failed CAT. You can find the extended anti fouler on eBay or it is a stock Dorman part and you friendly autoparts store should have them or can order from their warehouse. They are listed as 18mm anti fouler.

If you use the correct site search box(above at top of page) and guess the proper search terms you will find that this topic has been discussed in detail several times before on this site.

What this will not accomplish is fooling the front O2 sensor so don't waste the time, money, effort it trying it on the front sensor.

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Old 04-17-2019, 08:34 PM   #5
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2001 SL2
Default Re: 02 sensor

UPDATE: HaH ! I got fooled ! I thought I had a problem with downstream 02 sensor.. Read the code with OBD reader..P0137. It finally dawned on me the sensor was doing it's job ! Turned out to be a leak in the flex pipe. It gets replaced Friday.
Thanks to you all for the comments.
"Don't shoot the messenger !"

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Old 04-17-2019, 10:29 PM   #6
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1998 SC2
Default Re: 02 sensor

At least you found the real problem and what is required to fix it before attempting something that would have just failed.

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