Every part of a car is affected in an accident. A front end collision that only damages the front, right? Maybe. The entire frame can be tweaked slightly. Interior trim can be knocked loose and start rattling 50,000 miles early. The mechanicals within climate controls can be tweaked and fail prematurely. The windows, when rolling up, will chafe a bit more and wear the motors faster. The door seals will have a harder time sealing as they age.
Furthermore, in the act of replacing components, many mechanics cut corners, leave out forgotten fasteners, electrical ties to prevent vibration, etc. Almost never is a car reassembled as well as it was from the factory.
Strange and mysterious gremlins tend to pop up all over in a car that has been in a wreck.
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