One problem related to emission control has been reported for the 2002 Mazda MAZDA6. The most recently reported issues are listed below.
From the day I drove my new 2002 mpv home the transmission mis-shifted and bucked. I called the dealer the following day and they told me that "the transmission computer was learning my driving habits and it would go away. After 3 months the problem persisted and began stalling at lights. I took the car in and they said they could find no problem. When I asked them what they needed to repair the problem they said that there were no computer upgrades for the transmission and I would have to wait until there were. A year passed and it continued to buck and stall. I took the car in again and told them I thought it was a "lemon" and I wanted it repaired. They took the car and "fixed it" but it has continued to mis shift regularly. At around 25,000 miles the engine light came on and a diagnostic test revealed it needed new plugs. After replacing the plugs it appeared to run less erratically. It now has 65,000 miles on it and a diagnostic test reveals that the #5 cylinder coil is out. Apparently each spark plug has its own coil. I have ordered the coil and am waiting to see what problem will come up next. In oct 2005 Mazda sent out a voluntary laboratory emission testing form. Since they wanted the vehicle for 2 weeks and I already didn't trust there competency I declined the offer. Nevertheless, this told me that they must be having emission problems as well. I cannot believe there has been no recall on this vehicle from the manufacturer or a government required recall. The dealer never fixed the problem from day one, the car is now out of warranty and now I have no recourse. I have lost all confidence in Mazda. I will be contacting some attorneys about a class action lawsuit. It seems like it will take a fatality on a freeway from a failed transmission before Mazda or the government will look into this!.