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Your truck is staying in closed loop. With a code 42 you must have a gasoline system. Usually it isn't a failed oxygen sensor. If you don't have the diagnoser software I would check for vacuum leaks and fuel pressure. I have had cracked intake manifolds and dirty mass air flow sensors cause the code. You can clean the sensor. If you post your email there is some information I could send you.
  • Posted 30 Oct 2015 15:20
  • By shovel_fx
  • joined 11 Mar'12 - 41 messages
  • Illinois, United States

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