2001 Volkswagen Jetta exhaust system problems

Discovered car was burning oil although it gave no indications. Told this was normal by dealer. Car almost stalled on three occasions under 20000 miles. Oxygen sensor was replaced after car almost stalled on major highway in front of oncoming traffic. Fixed after three seperate trips to dealer. Car has had all sheduled oil changes and maintainence sinse purchase.

Dt*: the contact stated the vehicle looses power intermittently, at any speed. The vehicle was seen by the service dealer who determined an oxygen sensor may need to be replaced. The contact is concerned because the dealer was able to determine the cause of the problem without inspecting the vehicle. The dealer informed the contact that oxygen sensor failure was a common problem with the diesel engine. Although, the dealer determined a possible cause of the problem, the vehicle was not repaired.