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#11
28th April 2013, 09:50 AM
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You can do them via OBD, but only master ECU, then you have to move slave ECU to master port. You will end up with 2 ECUs that want to be masters which then need to be adapted correctly so that one is master and other one slave otherwise it will be running only 4 cylinders. I have not done any myself but I know that people, even professional tuners have run into this issue and some even ended up with bricked ECUs and forked out for 2 new ECUs from dealer.
If I had 4.2TDI I would definitely remap it but I would invest in BDM just in case, it's not all that expensive comparing to the value of car or 2 new ECUs. You can always sell it on later or keep as backup for any future jobs.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure 
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