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The ECL come on at after about 30 to 50 miles of driving while I use the California summer fuel and goes off while I use the California winter fuel in November, has anyone had the same experience

Original owner 314000 mile well maintained no vacuum leaks, all soft and hard vacuum lines replaced or in great condition, original cat system,replacement turbo, purge valve replacement, runs great
Thank you
 

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If you have a check engine light, then the car is storing a code. Use a code scanner and report back what that code is, that'll help determine what the problem is.

Are you sure the CEL has left with the change in fuel, or has your check engine light burnt out? Turn the ignition to position II without starting the car and all the working dash lights will illuminate.
 

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The first smart idea. We need more information.And the indicator is the DTC or "diagnostic trouble code" indicator. Or the CEL as aformentioned. You possibly have a fuel trim code. which may mean many different posibilities.
 
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