My engine check light seems to flash twice every now and then (about once a week or 2 weeks). It happens with the PFC and at random throttle positions.
What could this mean?
As Tink said, it's likley it's the knock sensor
To check if it's pinging, take it back to your tuner & have it checked.
If the light can be made to flash without any actual knock (pinging)
It could be something as simple as valve clearances. (normally this is the case)
Failing that, it may be a faulty knock sensor. (Not so common)
Hope that helps.
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