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Instantly as in as soon as you cranked up the the car or did you drive it a bit first?
if it came on as soon as you cranked it I would check the maf harness is properly connected and the sensor is in the pipe the correct way.
If you had to drive it for a bit before it can on then make sure you don't have any leaks between the maf and the throttle body.
Either way you need to pull the code asap. I don't see how the tune could cause any issues, but you need to see what the code is before your flash it... can't you use ecutek to check the codes?
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