this issue effects FRs and any other vehicle with the 170pd tdi engine due to how the ecu works. it does not effect the 2.0 pd tdi 140 or the 1.9 pd tdis - they'll still run with a faulty injector.
the faulty injector spikes the ecu and shuts the fuelling - this also throws up a main power relay fault.
it effects vehicle built around 6/2006 to 6/2007 but that doesnt exclude any others from the fault.
seat technical or VW uk wont issue technical bullitens on the fault because:
a. they know little about the cause
b. are not willing to recognise it as a commmon
problem
seat uk are pretty useless with any major issues like this, it has no real giveaway signs and can just occur out of the blue, as most of you guys have found.
please feel free to ask me anything about the issue as i've dealt with a few.