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My engine check light came on and it said "Catalyst Threshold Efficiency Low."

(2005 Acura TL)
in Gardena, CA on January 03, 2013
What does this mean? Someone please help!
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Popular Answer
of Greg's Orange Auto on January 03, 2013
one of your catts is going bad did it say bank1 or 2 and per catt or post catt. it means you o2 sensors are not seeing enough difference between pre o2 and post 02 but u need to figure out if its an 02 issue or catt issue.rec seeing a mech that knows these cars for proper diag
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