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This is why I recommend people buy an inexpensive OBDII reader to read out the code(s) and see what the check engine light (CEL) means. If it is something like 431 that's cat efficiency and could mean that you have 400 cell cats that didn't do a good enough job of scrubbing the exhaust and your dealer will replace them with 600 cell units. Could be any number of things and without knowing the code we would just be guessing so a trip to the dealer to have them read it out is in order.
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