DIC Code P0420
Thread Starter
Melting Slicks
Joined: Oct 2002
Posts: 2,492
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From: Williamson New York
DIC Code P0420
Low Catalyst efficiency--- Have High Flo Cats on car with my DnyaMaxx Header System-- Just got this code-- Rear cats are turned off via dynotuner-- Any ideas? Thanks in advance-
Team Owner
Joined: Jul 2004
Posts: 124,398
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From: .... NJ
Cruise-In VII Veteran
St. Jude Donor '05 thru '19
Originally Posted by PVHolgado
Low Catalyst efficiency--- Have High Flo Cats on car with my DnyaMaxx Header System-- Just got this code-- Rear cats are turned off via dynotuner-- Any ideas? Thanks in advance-
You can't turn off the rear cats
, go back and tell the tuner to turn off the rear O2s since that code is for the sensor downstream (after) the catalytic converter on bank 1
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
Originally Posted by PVHolgado
Low Catalyst efficiency--- Have High Flo Cats on car with my DnyaMaxx Header System-- Just got this code-- Rear cats are turned off via dynotuner-- Any ideas? Thanks in advance-
Thread Starter
Melting Slicks
Joined: Oct 2002
Posts: 2,492
Likes: 0
From: Williamson New York
i meant the rear O2's were supposedly turned off-- Could they be and still give me this code--if not I need to discuss this with my tuner who was supposed to shut off O2's-- 
Drifting
Joined: Dec 2005
Posts: 1,720
Likes: 3
From: East Hampton CT
The tuner missed some of the codes to turn off. There are tons of them beuryed all over in your ECU. In tunercat, I was able to match the code with the actual ECU setting and turn it right off "no error reporting". Worked great.
