Had a problem on a drive this weekend. My 2013 cayenne diesel went into limp mode and was dropping diesel out. It WA coming from the pressure sensor or diesel injector rail. Rac came out and checked over. Found leaking from pressure sensor. To temporarily fix put Ptfe tape on thread. Run a couple of steady short runs fine. But under harder driving know leaking again, any ideas or common problems please. It's the v6 Audi unit.