94 Ej1 check engine light is on from new headers? - D-series.org

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Old 09-02-2009, 07:01 AM   #1 (permalink)
 
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Exclamation 94 Ej1 check engine light is on from new headers?

I installed a new set of headers and a new O2 sensor because the old one was rusted on. I am getting a CEL and the code is for bad O2 sensor. But its new! I tried unplugging the battery and resetting ecu but nothing, light still comes on. Any ideas suggestions, solutions? The light on my dash is driving me crazy!!!

Thanks this is my first thread and I hope to get on here and learn new things as well as share some of my knowledge with everyone

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Old 09-02-2009, 07:09 AM   #2 (permalink)
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um first thing...is it plugged in? If so then its possible its a defective unit
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Old 09-02-2009, 07:55 AM   #3 (permalink)
 
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Yeah its plugged in.
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Old 09-04-2009, 04:38 AM   #4 (permalink)
 
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I swapped it for another new and still same thing, any other ideas?
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Old 09-04-2009, 05:44 AM   #5 (permalink)
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Quote:
Originally Posted by nelsonfelizjr View Post
I swapped it for another new and still same thing, any other ideas?
reset the ecu? unplug battery for a couple min. put key in and turn to on and "attempt" to start. it wont cause obviously battery is disconnected. after that plug battery back and start see if it comes back.
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Old 09-10-2009, 07:34 AM   #6 (permalink)
 
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yeah i've tried that several different ways, unplug battery, "attempt" to start, pulled fuse for ecu, nothing, this is crazy. it shouldnt be that hard to figure out, but it is. Ugh. Thanks for all your responses thus far any other ideas and suggestions are greatly appreciated
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Old 09-10-2009, 07:39 AM   #7 (permalink)
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go under the hood
unplug ecu fuse
disconnect battery
wait 5 mins
reconnect battery
replace fuse

That's what I did for mine and it cleared it

What brand sensor you using??
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