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Hello. I have a rav4 2004 (US). How often are you supposed to replace the coils? I replaced my spark plugs and I noticed that the wiring for the coils are exposed. They dont have the covers over them. Looks like they cracked. Anyone know the part number to replace them or the name of them? I have attached a pic. Will the wires burn being exposed like that? Any assistance would be great. thank
 

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Unless a coil fails there is no need or advantage to replacing it.
The wires are low voltage so as long as they aren't frayed with the copper showing and the possibility of shorting out they are fine. If the insulation is worn it can simply be taped up.
 
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