2007 durango limited, 5.7 L 192K KM ... After sitting all night - dead cold engine - (75 degree F temperature outside) -- Starts fine, runs fine right up until it wants to change over from open loop to closed loop (about a mile), thermostat just coming up on the half way mark. Engine stutters, drops down into idle mode, ETC lightning bolt comes on. If you then turn key off/on it will restart and run (sometimes fault immediately comes back one or two more times but clears again with off/on) .....
Then .... it runs fine the rest of the day. --- check codes and have both P1128 and P1129 codes .... thats it.
Dealer checked vehicle ... said unable to find fault ... I specifically asked them to check the O2's -- (of course by then it was warm and running) ---- This all started after a very violent shaking on a really bad logging road.

Any suggestions our there ....

 

Moved to correct section.

 

2006 Durango 4.7 L
Have P1128 and P1129 codes along with P0132 and P0152. This is after a reman long block engine install. There were no codes before change and all sensors were moved to new engine from original. Not having any running problems as it seems to run well but codes remain. I have checked connections and sensors for any damage but have not found problem. I still suspect some outside influence like a connection or wire.

And suggestion on where to look next?

 

Fixed:
The problem was in the engine harness connector to ECM at fuse/breaker panel box. The pin for the green/white wire on male side ( 2nd wire down against box) was pushed back. Repair was simple, just snapped pin back in place and reconnected connector.