BECOME A MEMBER
Sign up with Facebook
I AGREE TO THE
Login with Facebook
BECOME A MEMBER
P Codes (powertrain)
P0400 - P0499
DIAGNOSTIC SHOWS P0420,HOW DO I REPAIR THAT.
1997 Mercury Marquis
Catalyst system Efficiency Below Threshold Bank 1 is what shows up. Took it in auto zone did a diagnostic and showed cadalack coverter. But today showed the P0420
Friday, June 8th, 2012 AT 4:36 PM
Best to have a pro look at it. It can be a converter bad, a coolant leak cooling off the converter, a bad O2 sensor, many things.
Friday, June 8th, 2012 AT 4:48 PM
to post a reply.
P0420 Cat Converter
I have a 2002 with a p0420 cat code the factory cat was replaced a couple of years ago after becoming clogged and had no issues to al
2003 Cadillac Deville Trouble Code P0420
I have an 03' cadillac deville base sedan and it is throwing the code p0420 (catalyst system low efficiency bank 1) this code just cam
2006 grand caravan 3 8l 72 000miles has a p0420 code catalyst efficency below threshold bank 1 would that be a up stream 02 sensor
2001 Grand Am P0420 Code
2001 pontiac grand am 3 4l v6 p0420 catalytic efficiency bank 1 code was tripping every 15 miles after replacing the thermostat wh
Found 159 related questions
Po420 On 2000 Grand Marquis
1996 Mercury Mystique Mercury Codes P0171 P0303 P0420
Manuals and Instructions
Need To Replace Your Fuel Pump? Do It Like A Pro
Ask a Car Question. It's Free!
Find a car manual for your car
Crankshaft Position Sensor Replace Chevrolet
Got A Rough Running Engine Misfire? Fix it Like The Pros
Got An Lean Exhaust Code P0171 P0174? Fix It Like The Pros
© 1999 - 2016 2CarPros, Inc.