I live in Washington state, have a 2011 3500 H/O 6.7L Diesel, Auto, 4:10 gears and tow a 12.5 K 5th wheel. In December 2013 I had a Check Engine Light (CEL)and took the truck to the dealer in the town I live in. They said the connectors for the o2 sensors needed to be rebuilt which they did. 2...