2005 Acura TL Q&A

2005 Acura TL Question: My engine check light came on and it said "Catalyst Threshold Efficiency Low."

What does this mean? Someone please help! -
Answer 1
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 -