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More likely MAF sensor failure. Posted by Flyer [Email] (#3102) [Profile/Gallery] (more from Flyer) on Wed, 20 Jul 2005 00:50:36 In Reply to: Fault code p0420 - catalyst efficiency below thld., SJCMarc, Tue, 19 Jul 2005 21:42:36 Members do not see ads below this line. - Help Keep This Site Online - Signup |
P0420 caused by MAF sensor reading exceeded 5g/s or 7g/s(auto) for more than 2 minutes with combination of cold coolant (below 70 celsius) with low rpm& speed (30~80 mph, 1200~2100rpm) with good working second O2 sensors
most likely, catalic convertor never went bad (less than 1% of chance).
So, I suspect bad MAF sensor (80% of chance) and rest of chance for o2 sensor or convertor malfunction.
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