What does"Catalyst system Efficiency Below Threshold" mean?
Senior Member
Joined: May 2002
Posts: 3,049
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From: OH
Or it could be a transient problem. I pulled the same code off my buddy's Accord, and reset the CEL, told him it would likely come back on. While he was researching cat prices it just never came back on.
Swollen Member
Joined: Feb 2006
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From: Show Me State
Originally Posted by totalimmortal
He drives a Chevy, what can you expect?
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BMW Tech
Joined: Oct 2002
Posts: 514
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From: Suffolk County, NY
its prob ur cat or ur o2 sensor is being lazy.
The same code poped up for me twice but i cleared it twice and it hasnt come back for almost 40k.
I know my cat is bad kuz when u shake it it rattles. but no cel so i still pass emissions
The same code poped up for me twice but i cleared it twice and it hasnt come back for almost 40k.
I know my cat is bad kuz when u shake it it rattles. but no cel so i still pass emissions
lots and lots of fail
Joined: Dec 1999
Posts: 23,004
Likes: 1
From: Deeeeeeeeeeeeeeetroit
Originally Posted by phat99accord
I know my cat is bad kuz when u shake it it rattles. but no cel so i still pass emissions
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Swollen Member
Joined: Feb 2006
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From: Show Me State
Originally Posted by 98CoupeV6
Sounds more like a loose heat shield. If your cat is bad you'd get awful nitrous oxide smell inside the car when accelerating up hills. I know because mine went bad at 150k and I didnt change it until 210k h:
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