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ITs weard .. My 85 L-type supra has the eng check light come on at 70mph and when you hit 80 mph it will go out .. I was thinking of o2 sensor ??

any ideas
 

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have you tried pulling the code? its most likely o2 sensor related. i had the same issue. mine was due to an exhaust leak at the head. i fixed the leak and the light never came back.
 
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