I'm guessing he's referring to the wiring harness or the injector wiring harness. Your car is really not old enough to be having that kind of a problem. Do a visual inspection of the wiring harness. If it has deteroiated to the point of needing replacement, you will know when you examine the wiring. If the mechanic is concerned about diagnosis and "looking good", ask him the basis for his suggestion regarding the wiring, if..that's what he is talking about. Get better information about what he is thinking about.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.