After the 50K warrenty service (the dealer charged MBUSA 7K) we have had this POS in 7 times because the check engine light keeps coming on. The latest was a oxygen sensor and catalitic replacement. Immediately upon return the transmission started shifting rough and big surprise the check engine light came on. Back to the shop and with 62k mi they think it needs a new transmission. The symptoms are still intermitent rough shifts and between 3-4 the engine revs before shifting up. The transmission was perfect before the sensor and catalitic replacement. What's up?
It's like the dealer swapped transmissions on us, anyone having similar problems?