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Old Feb 4, 2021
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Flashing check engine light

2011 civic lx. 208000 miles
Replaced the plugs about a year ago with the proper plugs. Asked here
coils are original

was Driving home from work and the car shudders and CEL was flashing. I pulled over and **** car off

waited about 5 minutes. Googling this.

started car again and light cel of off. Car is driving fine. Went to read any codes and there were none. I thought this was weird.

any thoughts?
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Old Feb 4, 2021
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Re: Flashing check engine light

Flashing light indicates a misfire.
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Old Feb 4, 2021
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Re: Flashing check engine light

That’s what I found. But no codes
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Old Feb 4, 2021
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Re: Flashing check engine light

Took it to a mechanic I trust. He said if it went off and no code. It could be a glitch.

if it comes back try to get a code. Reader is in my car now.

-time chain jumping he said it wouldn’t clear.

-possible bad coil. Try to get a code to determine which coil. Then swap two to see if it follows a coil

keep driving it. If it comes back we can go from there
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Old Feb 4, 2021
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Re: Flashing check engine light

get a dongle to transmit OBDII from amazon
get torque pro for your smartphone.
turn log data

you should have everything logged as you drive
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Old Feb 4, 2021
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Re: Flashing check engine light

Originally Posted by Chezboat24
Flashing light indicates a misfire.
specifically, catalyst damaging misfire condition.

if it's running fine now,you may not necessarily have the CEL illuminated, but misfire codes should be stored. Unless you actually got it scanned and zero codes -- stored or otherwise -- don't exist, then that's just weird.
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Old Feb 5, 2021
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Re: Flashing check engine light

Originally Posted by xRiCeBoYx
specifically, catalyst damaging misfire condition.

if it's running fine now,you may not necessarily have the CEL illuminated, but misfire codes should be stored. Unless you actually got it scanned and zero codes -- stored or otherwise -- don't exist, then that's just weird.
no codes pending or stored.
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Old Feb 5, 2021
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Re: Flashing check engine light

Originally Posted by sdaidoji
get a dongle to transmit OBDII from amazon
get torque pro for your smartphone.
turn log data

you should have everything logged as you drive
can you recommend one. I’ll grab it asap
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Old Feb 5, 2021
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Re: Flashing check engine light

Drove to work this am, 35 miles of highway. No issues
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Old Feb 5, 2021
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Re: Flashing check engine light

FOXWELL NT301 OBD2 Scanner Professional Mechanic OBDII Diagnostic Code Reader Tool for Check Engine Light
Amazon Amazon

This is my code reader. It should do live data. I Think.
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Old Feb 5, 2021
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Re: Flashing check engine light

Originally Posted by EarleD
can you recommend one. I’ll grab it asap
too many of them.

WIFI models did mess up my phone reception, so i would say bluetooth model is better.

choose something in the mid-range to low on price range (too cheap is dangerous, meant as likely to live longer, too expensive is likely rip-off)
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Old Feb 5, 2021
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Re: Flashing check engine light

My reader can show live info. It worked on my way home. Have no idea what I’m looking at though. Lots of numbers changing constantly

thanks for your help
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Old Feb 8, 2021
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Re: Flashing check engine light

Ok. It’s been about 200 miles and nothing. I figure a maybe a flakey coil.

should I change them? They are original. 208000 miles. Car runs great.
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Old Feb 8, 2021
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Re: Flashing check engine light

my coils have been there since 2002, not sure honda coils actually gets bad so often.
just wait for next or keep an eye to anything (like MPG going down)
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Old Feb 22, 2021
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Re: Flashing check engine light

Been a couple of weeks. No issues at all. 🤷‍♂️
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Old Feb 22, 2021
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Re: Flashing check engine light

No news is good news
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