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03-25-2008, 08:51 AM #1
ses light came on, come in to help with code
had the car out on saturday and the SES light came on... my reader said P0420 "Catalyst System Efficiency Below Threshold"
i erased the code and it didn't come back but anybody have this before?? could it have to do with having a SLP maf or do you think there is something wrong with the O2s????
i have not had the car out since cause of the weather so i'm not sure if it will come back or not.....
thanksLast edited by krese; 03-25-2008 at 08:58 AM.
96 Trans AM WS6 (only 36k miles): Pacesetter LTs, ORY, magnaflow, !egr, !air, BMR STB, BMR LCAs, UMI SFCs, Alpine type R components up front, 2 12" Alpine type E subs, Alpine CDE-102 deck, Alpine 500m amp
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03-25-2008, 11:09 AM #2
ur cats either going bad or the o2 is on its way out
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03-25-2008, 11:12 AM #3
- Join Date
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2016 Camaro SS - Summit- 2001 Trans Am WS6 - NBM
Agreed with above post, bad cats. I have the same code. Takes a few cycles to come back up after it's cleared too. And your o2's are getting the crap cooked out of them now too. Hurry and get those cats changed out or cut em off before you have to spend more money
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03-25-2008, 11:51 AM #4
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03-25-2008, 11:53 AM #5
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03-25-2008, 01:59 PM #6
I just got the same code this weekend.
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03-25-2008, 03:47 PM #7
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- Jul 2007
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black- 2002 firehawk 94 Z28
find someone with an obd2 have them deleted gut your cats and never have to fool with them again.
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03-25-2008, 04:16 PM #8
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03-25-2008, 04:17 PM #9
what kind of test do you have? just the obd test or the whole thing
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03-25-2008, 05:53 PM #10
they don't do a sniffer but they hook it up to a computer and check to make sure that the O2s read something.. about the only thing that would work if i got rid of the cats would be the O2 spoofers but they are not sold anymore... they also look under the car to make sure cats are there.
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03-25-2008, 06:05 PM #11
thats an easy fix...gut your cats..get a tune and delete them...
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03-25-2008, 06:54 PM #12
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- Nov 2007
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- SATX
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Pewter- 2000 Trans Am
is it legal in Texas?
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03-25-2008, 07:02 PM #13
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03-25-2008, 09:30 PM #14
well i have seen used o2 sims for sale on ebay and on here for around $70 for the pair. but like said above the cats are still under warranty.
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03-26-2008, 12:01 PM #15
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- Feb 2007
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- FairField, CA
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RED 35TH ANIVERSARY PKG- 2002 CAMARO SS 35th LE
yeah mine came on like a week ago.. for the samething P0420 cat. effi. below threshold.. I call gm and they told me they would have to look at it first and if it ended up being the cat. Then they would go ahead and warranty it. But if its not the cat then they would charge me for the diagnostic fee... I thought to myself thats a bunch of BS... what do you guys think..?
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03-26-2008, 12:04 PM #16
The cats are on recall. Call the dealer, give them your vin, schedule an appointment get it fixed for free. If the dealer needs to deviate from the manual due to aftermarket exhaust or such, expect to pay a standard 1 hour labor fee.
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03-26-2008, 02:15 PM #17
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RED 35TH ANIVERSARY PKG- 2002 CAMARO SS 35th LE
now i have the SLP Mass and CAI.. should i remove any of it.. or just say it came like that from the factory.. I mean SLP did do aftermarket stuff on the car when you buy from the dealer if you requested it.. any input.?
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03-28-2008, 11:06 AM #18
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RED 35TH ANIVERSARY PKG- 2002 CAMARO SS 35th LE
Well just came back from GM and everthing is koo they are gonna warranty the cat. So it ended up being the cat.. So to recap I had a DTC: P0420 cat effi. below thereshold bank 1.. I change the rear 02 sensor and it came back up after i cleared the code. I then switch back my old 02 and took out the new one. Went to GM and had them look at the cat. Cat is no good and they are gonna warranty it..
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03-28-2008, 02:23 PM #19
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Navy Blue Metallic- '00 Formy A4
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03-29-2008, 01:02 PM #20
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- Newport, RI
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Navy Blue Metallic- '00 Formy A4
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