Haha, Still having the same problem. Just got the Passport back after 6 Months at the dealership for the Trailing Arm Bracket Recall... My driver side seperated in 2009 and we welded it so good that they wouldn't buy the vehicle back
I hope the other side breaks loose after their Stage 1 Spray Wax wears off.
I was reading my own thread hoping to find an answer and then noticed it was me having the problem in the thread.. oops
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Still P0304 and P0440 now if anyone has any ideas it would be appreciated.
For a while it went to P0300 so I am glad it is back to cylinder #4 at least it gives me somewhere to look closer