I am surprised this complaint is not on here I see it all over the place in other places. Check engine light came on and it was p0420 code. Catalyst Efficiency Below Normal. My mechanic replaced the catalytic converter (500 bucks) did not work. There is a recall for one way fuel valve that might cause it so we are going to try that. If that doesn't work we will try the o2 sensors. I will let you know what the final fix is.