I think that the wires for the sensors are extremely thin, since they are only as thick as absolutely necessary. Over time, I presume that the resistance of the wires increases as they corrode. I have been having slightly high negative fuel trim, about 10-15 percent at times, so I checked the MAP sensor. The MAP sensor reads 16 IN HG at idle, but a vacuum gauge shows 18. I swapped the sensor out with the one from my 04 Civic with the same result. The oxygen sensor also intermittently works, but is dead most of the time. I think that the wiring is wearing out, so I plan to rewire the important sensors that operate off of resistance with new 14 gauge wire to reduce resistance and help the sensors function better. Can't hurt to have less resistance and could help the sensors function better. What do you think about my idea?

 

I think it is unnecessary. There will be little to no benefit unless the wires youre replacing are faulty.