What is going on with my vehicle?

Question

I have 2010 Chevy Equinox I bought used in September. First week, I got I had to get the camshaft sensor replaced, a month later the knock sensor replaced. Now, it's been a month and half since my vehicle has been out of the shop and the check engine light comes on and the code is P0420. I'm having issues with the dealership I bought it from right now. I want to know why all this is going on. I have about 75,000 miles.

Answer 1

P0420 Catalyst system below effiency Bank 1

What size engine do you have ? If you have a four cylinder or the 2.4 engine there has been several Campaigns dealing with this Year Make and Model from the timing chain , which is the fuel pump. engine Balance chain , and a Campaign for the EVAP emission system with a ECM reprogramming.