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Discussion Starter #1
I have a weird issue going on.

When I drive the car like an old lady my cel light comes. I usually stay below 4k RPM. I noticed when the car spends some time above 4k RPM that the cel goes away. Does this mean that the cat is losing its efficiency at low RPMs?
 

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Have you checked to see what the code is? And for me 4K rpm is pretty high and I only get there when I’m having to merge onto the interstate or something.
 

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Could be a o2 sensor. Maybe the sensor reading measurements or staying above the 4k amount. Wouldn't doubt it's a o2 or mass air flow
 

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The CEL usually comes on and stays on. Usually if it clears itself it would be after a driving cycle or two. If it goes off and on I’d suspect a wiring issue. Check the code. Cat code is P0420 and it would be very strange for it to go on and off like that.


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