Two problems related to engine have been reported for the 2000 Mazda 626. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 Mazda 626 based on all problems reported for the 2000 626.
Transmission went out without warning on my 2000 Mazda 626 and also a few month later the motor went out too, I had to buy a new transmission and motor.
The cylinder heads have failed twice due to internal failure and a crack near the #2 cylinder spark plug hole causing the rpm's to be very high, when putting the vehicle in drive it suddenly slams into gear, when accelerating from a stop position the engine races and when the vehicle is started it shakes and trembles as if the vehicle is going to shut off. Nlm.