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2002 Toyota Corolla CE 4dr Sedan Manual (Natl)

2002 Toyota Corolla
Trim Info:
Front Wheel Drive, 4 Door Sedan, Compact
32 mpg city / 41 mpg hwy
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March 5, 2013, 2:02 pm

Abdou K
 

Question: check engine light

the scanner gives code po420 and the definition are catalyst system efficiency below threshold-bank 1 probale cause, 661-air leak in exhaust before rear ho2s ( heated oxgen sensor) bank1
662- AF sensor error
663- fuel system fault
664-faulty catalytic convertar, then what to be need to replace


March 8, 2013, 3:08 pm

Tyler O
Expert Mechanic

This is usually just a worn out catalyst, but it's good to check the cheaper to fix items first. Check for air leaks, check o2 sensors etc


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