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Just because the check engine light isn't lit up doesn't mean there aren't codes stored on the ECU. When I had a code 34 for bad KS or KS wiring (killed performance from 3000+) there was no light. I have a short in my ect wiring harness now, and there is no light. Also I had a code for the o2 sensor, and again no light. It takes all of 5 minutes to pull the codes, and you won't even get greasy.
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