Certain car manufacturers can see if the ECU has been flashed more than once or even how many times.
1 = factory 3? Factory, remap, back to factory - no warranty kthxbaix
ECU from a breakers yard, keep the virgin one on the shelf and stick it to the man.
Mind you, they are probably face-meltingly expensive these days.
I like carburetors.
Not anymore :( engine ecus are 'locked' to the car part of the immobiliser.
I like a programmable engine management system.
@Jung started
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Certain car manufacturers can see if the ECU has been flashed more than once or even how many times.
1 = factory
3? Factory, remap, back to factory - no warranty kthxbaix