2001 Toyota Corolla failed smog check

2001 TOYOTA COROLLA
19,970 MILES • 4 CYL • 2WD • AUTOMATIC
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BUTA
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hi,
my toyota recently failed smog test with only 1 problem.
NO (PPM) ------ MAX 477,AVE 16, MEAS 764. so on
15 mph tested too much. can you point out what can cause this? thank you kindly.
Apr 20, 2010 at 10:09 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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