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Discussion Starter #1
Hi,

If there is a car which has done say 100K and the engine was swapped for one which had done just 10K, what would the mileometer read?

Is the reading stored in ECU?

If you swap an engine do you need to swap the ECU? (maybe the ECU holds calibration data?)

I'm sure someone will know the answer!
 

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A.O.N. - Platinum Member
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38,432 Posts
as far as I know the milleage will stay at 100k, you will need to have the ECA reprogrammed with the milleage of the new engine
 

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Mileage is for the car not engine, modifying it is called clocking and illegal although it is obviously a plus point if you can prove the engine is newer than car on sale.
 

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A.O.N - Approved Specialist
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9,343 Posts
The mileage is stored in the ECM as well as the clocks and can be accessed through diagnostics.

If the two don't match to within about 100 miles, serious questions need to be asked as to why.
 
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