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      09-05-2012, 04:59 PM   #136
Mike Benvo
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Drives: Harrop M3 / F10 M5 / F82 M4
Join Date: Apr 2008
Location: SoCal

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2015 BMW M3  [0.00]
2015 BMW M5  [0.00]
2008 BMW M3  [3.50]
2004 BMW M3  [0.00]
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Originally Posted by positiveions View Post
Well, the "engine check light" came on. And it says to service car soon. Though, I ran the diagnostic after driving the car, it had no fault code.
Now to program the car with the tune.
If the SES light is on after programming the tune, you should start the car four times. After the forth start the CEL will clear. Even though the CEL is on, there will be no faults stored.

Reason for this is that on some cars the ECU needs to be cycled 4 times to clear the bootloader from thinking there is an error with the checksum correction. It will turn off on the fourth start like clockwork.

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