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Thanks for the info!
I did not know the conditions for the ECU to test the system and that it could be effected by outside temperature. It's been bitter cold in NY, so maybe that's why it lasted so long?
What's the best way to get the check engine light to come back on? 2 long trips?
I will check out siennachat.com to see if they can help also.
As for fuel system additives, I noticed that Redline SI-raises the octane and Lucas Deep Clean "eliminates the need for high octane fuel." I wonder if both raise the octane just enough to make the engine run better and keep the check engine light off?
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