If I've had an engine warning light flash, but then go off, can a fault still be foun

Do you have a decat by any chance? That can cause the miss-fire error code to come up sometimes and then it'll clear after a while. I've found that if I cruise at 70mph for any length of time my MIL will come on with the error 'check emissions', doesn't happen if I cruise at 65 or 75 though
 

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