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I changed the FAP at 80000, in January 2008, without waiting any alarm nor message.
Nota : before the FAP and after the turbo, there is a KAT on the pipe too.
I think that if you are waiting for an alarm message saying for instance "no additive", some trouble could occur on your engine because the cleaning period would have no effect on the clogging due to this missing additive.
As this cleaning period happens every 400-500 km approx, you have to fill this additive and change your FAP in a short period of time.
It could be done, be imaging you are on holiday or away from your usual garage, isn't there too much risk ?
I guess the engine will run in its safety mode after the pressure transducer will give the alarm...
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