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Re: P0420 Posted by SWEDECAR [Email] (#112) [Profile/Gallery] (more from SWEDECAR) on Sat, 18 Jan 2014 09:06:01 In Reply to: P0420, Peter Robson, Fri, 17 Jan 2014 22:54:59 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Saab's Tech 2 test of catalytic converter does not follow the ODB2 standards and therefore it is very common that the Tech 2 test pass with flying colors but the car fail at the smog test station or setting code P-0420.
But first I would go back to the original ECU and see if the cat is working and not setting codes and if no codes are set, I would suspect something is wrong with the tuned ECU.
Seems to remember someone mentioning installing spark plug foulers for the rear O2 sensor to fool the system. Maybe it is more about that on the performance board.
Anders
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