feul injectors

[JonA]

HI I need to replace a couple of injectors on our 2.0 TDi (170hp) 2007 A3.

one injector has the code 03G130073 with a suffix T.  looking a round there are a lot (or several ) suffix letters for this same injector number.

Are they different or can they be interchanged?  eg. some places seems to suggest that T and M suffixs are suitable.

is the letter a calibration code, ie something that would need to be entered into the ECU so usable but not a direct swap?

 

regards