Hi has any one come across this problem with a RR
Its new unused , you flash the tune & OS in , hit the ? button and the loaded file is the same as in the chip , but when you read out the tune there is a checksum error on the OS (using OS3 or stock OS ) . the car wont start ( have tryed VATS off ) , when you turn it on ,the fuel pump does not prime for as long as it should
any one got any things i should try before i send it back
Geoff