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Thread: Service engine soon code P0420
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09-09-2010, 09:13 AM #1
- Join Date
- Mar 2009
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- Pa
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- 26
Black- 2002 Trans-Am WS-6
Service engine soon code P0420
Just picked up an OBD2 reader from Harbor Freight. Ran the scan and came back with code P0420 (Catalyist system efficiency below threshold, left bank) Any ideas what this could be? I cleaned out the PCV valve with throttle body cleaner several days ago and wondering if it's possible that this may be the cause. When they say "left bank" is that from the view inside or standing in front of the vehicle.
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09-09-2010, 09:16 AM #2
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- Jan 2006
- Location
- Shepherd, Michigan
- Age
- 36
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- 11,770
blacker than wesleysnipes- 98' trans am
P0420 is for bank one ..... this code is basically saying your cat is junk....scrap it and run no cats.or buy a new one
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09-09-2010, 05:43 PM #3
- Join Date
- Apr 2008
- Location
- Madison, WI
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- 7,006
1999 Formula WS6 M6-sold- 2001 Silverado Z71
There is a GM special policy that extended the cat converter warranty to 10 years/120,000 miles.
Refer to this thread for more info.
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09-11-2010, 07:12 AM #4
Yep, it relates to a bad cat.
09 Vulcan 900 custom.
2007 Subaru Legacy 2.5i
1998 Z/28 Hardtop A4 | Y2K wheels | SLP Lid | Magnaflow catback |cutout | Hotchkis LCA'S/PHB | BMR TA and D/S Loop| Tuned by Frost....300rwhp/308rwtq
97 Cobra- bolt ons | full exhaust| 4.30's| suspension | SCT tune- sold!
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09-13-2010, 08:02 AM #5
- Join Date
- Jul 2006
- Location
- Loveland/Ft. Collins, CO
- Age
- 44
- Posts
- 363
Blue- 2001 Formula Firehawk
You better hurry on the replacement if you go the warrenty route. It expires November 9th or 12th or something they told me.
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