I have a '01 X5 4.4 that blows a large amount of white smoke at start up, then very little when driving. After idling (at stop) it will blow white smoke again. When it first started (couple of weeks ago) the temperature gauge reads normal and no noticeable change in power at acceleration or while driving.
Now the check engine light has come on and the codes are P1341, P1343, P1345 and P1349
Temperature gauge is still normal and a slight hesitation in power when accelerating.
The dealer is saying that it is either the crank case vent valve or the exhaust stem seals.
I have also heard that it may be something with the coolant.
Anyone else had or seen this problem?