CEL Light for Catalytic Conv. - 8th Generation Honda Civic Forum
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Old 05-30-2019, 08:50 AM   #1 (permalink)
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Dremersvision has their car in neutral right now
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CEL Light for Catalytic Conv.

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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Old 05-30-2019, 09:13 AM   #2 (permalink)
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Dthurston has their car in neutral right now
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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 Im having to merge onto the interstate or something.

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Old 06-05-2019, 12:33 AM   #3 (permalink)
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Muffin_lion just put it into 1st gear on 8thcivic
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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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Old 07-20-2019, 03:59 AM   #4 (permalink)
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SevenEleven has their car in neutral right now
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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 Id 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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