Change 02 when changing Cat ?

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Old 12-28-2006, 11:17 PM
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Change 02 when changing Cat ?

Is it usually necessary to change the 02 sensor when you are having the Catalytic Converter replaced?
Old 12-28-2006, 11:56 PM
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No, you don't need to change the o2; unless the o2 is malfunction.
Old 12-29-2006, 10:00 AM
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how many miles do you have that your changing your cat?
Old 12-29-2006, 11:27 AM
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160,000 miles and counting

I got the P0420 code with the CEL coming on intermittently, and now it stays on
Old 12-29-2006, 04:00 PM
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nice. I just hit 101k and was wondering how long they would last. The car feels a little sluggish sometimes an i wonder if it is related to that. I already changed the plugs, cleaned the intake manifold and ran seafoam through everything 2k miles ago. Car has never thrown any codes yet.
Old 12-29-2006, 10:11 PM
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Cat problems can definitely make a car sluggish
My buddy had a mechanical tell him the cat was the problem with an impala that had 125K and no check engine light?????? it fixed it

My check engine light would come on and the car would immediately feel sluggish and/or constipated, it would go off and ride better.

I got tired of it and changed the cat, hopefully the CEL goes off soon.....
Old 01-04-2007, 07:00 PM
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My cat lasted approximately 100,000 miles, just barely missed the 80k mile federal warranty. As for my O2 sensors, I am still on my original ones at 170,000 miles without any signs of trouble. Don't understand how some manufacturers recommend changing them things so often, it seems like they last a lifetime on these cars.
Old 01-07-2007, 02:08 PM
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Resetting P0420 code afetr replacing cat?

I just replaced my cat with a Random Technology high flow cat (183-20002). My 99 TL started giving me a P0420 code at 88K miles but I just replaced the cat at 155K. Should I reset the P0420 code with my scanner or let it clear itself?
Old 03-19-2007, 10:34 PM
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I got my CEL with P0420 code. How can I reset the OBD code without a scanner?
Old 03-20-2007, 07:44 AM
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Originally Posted by Brewgod23
I got my CEL with P0420 code. How can I reset the OBD code without a scanner?
Pull the Clock backup fuse on the passenger side dash fuse panel for 10 min.
Old 04-09-2012, 04:21 PM
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Originally Posted by fsttyms1
Pull the Clock backup fuse on the passenger side dash fuse panel for 10 min.
I was told that a scanner shows when a system was reset - that's why I needed to drive 40 miles after a reset before taking her back to the emissions inspection. Does this 10 min fuse trick show a reset on the scanner?
Old 04-09-2012, 04:27 PM
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Originally Posted by DaHadster
I was told that a scanner shows when a system was reset - that's why I needed to drive 40 miles after a reset before taking her back to the emissions inspection. Does this 10 min fuse trick show a reset on the scanner?
Yes, that is only to erase codes and the CEL. Testing equip will show that the ecu was reset and if it doesnt meet the requirements they will fail you and tell you to come back.
Old 04-09-2012, 04:47 PM
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196K = OEM CAT, OEM 02 Sensors... Pass Emission Tests with flying colors...
Old 04-09-2012, 05:17 PM
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I just wrote about the special driving procedure in another thread- for after ecu reset and headed for smog test
Need to run the engine thru every condition,,not just cruise around 40 minutes and think its recorded enough data for inspection

most of us are going with `1 minute` of clock fuse removal will clear and reset the ecu
You can disconnect the battery neg cable instead but that requires radio code input,,
while clock fuse is the secret backup power to ecu and doesnt affect radio `security`
(disconnect batt and radio thinks its being stolen)
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