Originally Posted by threewirefire
If you have 138 injectors, I would replace them all. I wouldn't worry about the coils. If one coil does turn out to be defective at some point in the future it's fine to replace just the defective coil. The plugs are relatively inexpensive-if you want to throw another set of plugs in after replacing the injectors, go for it. Do bear in mind that there are calibration #'s on each injector that need to be changed in the dme when an injector is replaced. Your car absolutely will not run properly if you just slap a set of injectors in it with performing the calibration procedure.
Not sure which ones I have. Maybe I will talk to the dealer to see if they can do the clean up, as yesterday the advisor said they dont do it so will have to check with them mechanics them selves. Whats the easiest way to check injector number?could thr dealer through the diagnostic computer? My car is 03/09 production