I own a 1.3 petrol 2006 Toyota Yaris with the MMT (semi-auto) transmission fitted. The car has done 40, 000miles now and the transmission just gets worse unfortunately which is a shame as it spoils an otherwise solid car. I wish I had shopped around and bought a manual Yaris now. I have looked into it and have heard that the system needs to be reprogrammed to improve gear change as the parts wear in/out, this is done via an ECU reset followed by a drive out in order for it to learn your driving style! hmm. The other fix I have heard is to replace ECU and Actuator which can cost £900- £1, 500! This is supposed to correct the problem for a time but some have reported reoccurring problems. Not great news and hard to believe Toyota are so set on pushing these MMT transmissions forward instead of switching back to full auto and standard manual options. (West Yorkshire)
