DIY F430 Fuel Injector replacement

Corsa:

Looking for some guidance on a small DIY project and general harness age issues. Am replacing the fuel injector in cylinder 4 (the easiest injector to get to). Do I need to remove the passenger frame stanchion or can I access the injector quick connect plug from under the car with belly panel off? Since the injector cable is wrapped with others as it travels toward the front of the engine, want to understand the process before I start pulling that apart.

Hoping this fixes my misfires but also am getting a Christmas tree of warning lights that magically disappeared while the dealership. Are others with 430/360 having to replace the engine harness? Dealership said May be brittle and causing electrical problems, firing off sensors in error. So they would replace the harness “first” for about $5,000. 2006 F430, 32,000 miles.

Thanks for any feedback

 

All my OBD codes point to a misfire, so was optimistically thinking, just do that. But the plug is way up at the front of the engine after being wrapped with other injector cords on the way. Can’t actually even see the connection.

While they maybe were more quiet initially, the Christmas tree lights were not solved by a new battery even though I always plug it in to the Ferrari trickle charger if it is in the garage even overnight. With 32k miles including a few thousand on the racetrack, I suspect my harness may be brittle and starting to go. Also apparently the grounds sometimes need to be refreshed. My dealer wants to “start with that” for $5,100 and see if that gets rid of the lights. Maybe that is the developing challenge with these cars as they age (?)