Page 1 of 2 12 LastLast
Results 1 to 20 of 26

ses light came on, come in to help with code

This is a discussion on ses light came on, come in to help with code within the General Help forums, part of the LSx Technical Help Section category; had the car out on saturday and the SES light came on... my reader said P0420 "Catalyst System Efficiency Below ...

  1. #1
    Member krese's Avatar
    Join Date
    Feb 2008
    Location
    Brewerton, New York
    Age
    42
    Posts
    544

    silver
    1996 Trans AM WS6

    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.....

    thanks
    Last edited by krese; 03-25-2008 at 09:58 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

  2. #2
    Member ultra_badass's Avatar
    Join Date
    Mar 2007
    Location
    Corpus Christi
    Posts
    257

    navy blue matallic
    2000 WS6 trans am M6

    ur cats either going bad or the o2 is on its way out

  3. #3
    Now in Summit LT1 Flavor! Y2KArcticSS's Avatar
    Join Date
    Mar 2007
    Location
    Henryetta/Tulsa Oklahoma
    Posts
    3,483

    Summit White
    2016 Camaro SS

    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

  4. #4
    Member krese's Avatar
    Join Date
    Feb 2008
    Location
    Brewerton, New York
    Age
    42
    Posts
    544

    silver
    1996 Trans AM WS6

    Quote Originally Posted by Mustang=Breakfast View Post
    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
    cats should still be under warranty no?

    2002 w/ 48k?

  5. #5
    Now in Summit LT1 Flavor! Y2KArcticSS's Avatar
    Join Date
    Mar 2007
    Location
    Henryetta/Tulsa Oklahoma
    Posts
    3,483

    Summit White
    2016 Camaro SS

    Quote Originally Posted by krese View Post
    cats should still be under warranty no?

    2002 w/ 48k?
    Definately, you've got 8 years or 120k to get them replaced thanks to GM extended warranty (they should've just recalled them, but they are gay)

  6. #6
    Pony Hater UKXK189's Avatar
    Join Date
    Jun 2007
    Location
    MN
    Age
    42
    Posts
    195

    Navy Blue Metallic
    2001 Trans Am

    I just got the same code this weekend.

  7. #7
    Senior Member t-rock's Avatar
    Join Date
    Jul 2007
    Location
    pocola oklahoma
    Age
    47
    Posts
    1,121

    black
    2002 firehawk 94 Z28

    find someone with an obd2 have them deleted gut your cats and never have to fool with them again.

  8. #8
    Member krese's Avatar
    Join Date
    Feb 2008
    Location
    Brewerton, New York
    Age
    42
    Posts
    544

    silver
    1996 Trans AM WS6

    Quote Originally Posted by t-rock View Post
    find someone with an obd2 have them deleted gut your cats and never have to fool with them again.
    won't pass the test if i do that...

  9. #9
    Member ultra_badass's Avatar
    Join Date
    Mar 2007
    Location
    Corpus Christi
    Posts
    257

    navy blue matallic
    2000 WS6 trans am M6

    what kind of test do you have? just the obd test or the whole thing

  10. #10
    Member krese's Avatar
    Join Date
    Feb 2008
    Location
    Brewerton, New York
    Age
    42
    Posts
    544

    silver
    1996 Trans AM WS6

    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.

  11. #11
    Member ultra_badass's Avatar
    Join Date
    Mar 2007
    Location
    Corpus Christi
    Posts
    257

    navy blue matallic
    2000 WS6 trans am M6

    thats an easy fix...gut your cats..get a tune and delete them...

  12. #12
    Member
    Join Date
    Nov 2007
    Location
    SATX
    Posts
    847

    Pewter
    2000 Trans Am

    is it legal in Texas?

  13. #13
    Member krese's Avatar
    Join Date
    Feb 2008
    Location
    Brewerton, New York
    Age
    42
    Posts
    544

    silver
    1996 Trans AM WS6

    Quote Originally Posted by ultra_badass View Post
    thats an easy fix...gut your cats..get a tune and delete them...
    this does NOT work.. if you DELETE them it shows that there is NO reading... like i said, the test MUST show a reading to pass... they are not stupid.

  14. #14
    Member ultra_badass's Avatar
    Join Date
    Mar 2007
    Location
    Corpus Christi
    Posts
    257

    navy blue matallic
    2000 WS6 trans am M6

    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.

  15. #15
    Member WARP211's Avatar
    Join Date
    Feb 2007
    Location
    FairField, CA
    Age
    36
    Posts
    398

    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..?

  16. #16
    Senior Member Danger731's Avatar
    Join Date
    Aug 2000
    Location
    Indy
    Posts
    6,712
    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.

  17. #17
    Member WARP211's Avatar
    Join Date
    Feb 2007
    Location
    FairField, CA
    Age
    36
    Posts
    398

    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.?

  18. #18
    Member WARP211's Avatar
    Join Date
    Feb 2007
    Location
    FairField, CA
    Age
    36
    Posts
    398

    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..


  19. #19
    Senior Member
    Join Date
    Apr 2007
    Location
    Newport, RI
    Posts
    1,550

    Navy Blue Metallic
    '00 Formy A4

    Quote Originally Posted by Danger731 View Post
    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.

    Is this all years of LS1's that are recalled?

    My SES light just came on this morning. I haven't had a chance to get the code pulled yet though. Would a bad cat/cats cause a rough idle too?

  20. #20
    Senior Member
    Join Date
    Apr 2007
    Location
    Newport, RI
    Posts
    1,550

    Navy Blue Metallic
    '00 Formy A4

    Quote Originally Posted by WARP211 View Post
    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..

    Cool man, I just had my code pulled and got the same one. I guess I'll be heading to the dealer on Monday.

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Help: SES light! what causes code p1416?
    By wbeauman in forum Computer & Tuning
    Replies: 5
    Last Post: 04-02-2009, 11:04 AM
  2. SES light, A.I.R. code?
    By ArcticZ06 in forum General Help
    Replies: 6
    Last Post: 09-29-2007, 09:46 PM
  3. SES light on and code p102
    By LS1 Trans am in forum General Help
    Replies: 14
    Last Post: 05-15-2007, 09:02 AM
  4. SES light.. wuts the code mean
    By rajiv1998 in forum Firebird / WS6
    Replies: 6
    Last Post: 05-01-2007, 07:00 PM
  5. SES Light Code# 1133
    By stevegrizzle in forum General Help
    Replies: 6
    Last Post: 10-27-2006, 12:12 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •