change everything plugs air fliter oil change front and back o2 sencers drove from god nos were its sayin on my freind machice it passes but engine light still on and i no i got to get it inspected their not gonna pass it
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2005 Toyota Corolla Question: engine light still on
Answer #1Visitor, May 30, 2010, 15:47
what code is stored??
Replytimer2766, May 30, 2010, 16:05Rookie
Answer #2patrick mannion from Greg Solow's Engine Room, May 30, 2010, 18:27Master
P0420 is low catalytic converter efficiency code. Usually a sign that the cat. converter is failing. This code can be set if the engine is out of tune or the Oxygen sensors are not operating correctly.