Code P0420 2003 SSEi
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rynmcdonald
- Posts like an LG3
- Posts: 337
- Joined: Mon Feb 11, 2013 5:55 am
- Year and Trim: 2003 Bonneville SSEi.
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Code P0420 2003 SSEi
That's my trouble code. I don't know if it's being set because I am running one step colder plugs OR that it's just seen better days and needs replaced. I tried clearing the code with an OBD II scantool and it came back on after 100 miles. I just hope that it's the sensor alone and nothing else.
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maroon111993
- Posts like an LG3
- Posts: 363
- Joined: Tue Jan 10, 2012 10:59 pm
- Year and Trim: 1997 Grand Prix GTP
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Re: Code P0420 2003 SSEi
Don't know if the bonnevilles have them but have you checked your O2 sensor behind your cat? I get this code every once in awhile (but that's because I actually removed my cat haha)
P0420 DTC Code - Catalyst System Efficiency Below Threshold
Not a major issue other than emissions... just an annoying Check Engine Light. haha
P0420 DTC Code - Catalyst System Efficiency Below Threshold
Not a major issue other than emissions... just an annoying Check Engine Light. haha
1997 Grand Prix GTP "Black Ice, 'cuz it's slick" - 17" Motegi Racing Rims, Hankook Optimo Performance Tires, 'Big 3' Wiring Upgrade, Weapon R Secret Weapon Intake w/ Ram Air, Larger SuperCharger lines, AutoLite 104's, U-Bend Delete, Resonator Delete, Cat Delete, Turbo Flowmaster Mufflers. 342bhp, 327 lb-ft torque, 9.091 boost psi @ 6,012 rpm.