po306
#3
P0306 is for a cylinder misfire on number 6 cylinder. Since you said it is the 4.2L V6, it is the last spark plug on the drivers side. Might be a good time to change all the plugs and wires or Coil boots(whichever it has). Not sure when the COP change over was on the truck. The O2 heater code for the one you mentioned is P0141.
Last edited by way2old; 05-08-2009 at 05:57 PM.