PHS by fax is very quick, very convenient. I went to look at a car Friday that was said to be a numbers matching 400...PHS made it easy to tell that it was not.
Motor unit number, located on engine just above the two letter engine code, should match PHS billing history.
Yellowbird makes a good point, but from my experience, the engine unit number is almost never listed on the PHS for some reason. I have seen it a few times, but not much.
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