If its not throwing codes and running well leave it alone .......... then it has more than likely had an EGR delete done, whereby the addition of a diode or 2 makes the ECU think its still there .......... Only on the Merc engine though the Italian jobs aren't fooled.
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2015 WK2 CRD Laredo( ZG, WG 2.7 )
Your Never Too Old To Learn Something Stupid.
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