The check engine light in my 2000 echo went on a couple of months ago. I took the car to a friend of mine who is a mechanic and he said that it had an exhaust system problem. He suggested that it might be the o2 sensor but said that it was not an immediate problem. A couple of weeks ago the problem got worse-- my car started stalling(sp) briefly at stop signs and refusing to accelerate on hills. I took it to another mechanic and had both 02 sensors changed. However, the problem continues and the check engine light is still on. The last mechanic I took it to said that it might be the MAPS sensor. Has anyone had a simular problem with their echo, if so what was the problem?