hi has anyone come across this problem?.. i bought this focus, it had injector issues.. i changed the injectors and it run for a while then one of the injector clamps snapped in half and the coil light started flashing... replaced the clamp and now its just coming up with error codes "injector range performance, and cylinder 2 above knock threshold"... engine running fine, leak off test done and spray pattern test on the injectors and they are perfect!! changed the injector in cylinder 2 anyway, engine is running sweet as, but cant remove the fault codes and it wont go out of limp??????????? help me please!!! also the dual mass fly wheel is clunking slightly when you start the car and when i turn it off... and the oil light flickers at idle as if the pick up needs cleaning or the oil switch needs replacing? just saying every problem incase they are linked somehow..... its really annoying me now!