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I finally got my car back from having Timing Chains, High Pressure Fuel Pump, Crankshaft Position Sensor, everything that's serviceable replaced and all 3 Catalytic Converters installed. Car runs great except he didn't replace the front motor mount (and even told me he thought it was bad). Now after I drove the car home the Check Engine Light came on. It's got Codes P0420 & P0430. I deleted them and drove about 100 miles and now the Check Engine Light is back on and had the same codes. Any ideas or does the car need to go to the dealership to have things updated because of all the parts that was replaced?
 

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The code itself doesn't always point to the exact fault. Sometime some old fashioned trouble shooting is needed.

I might be looking for exhaust leaks, vacuum leaks, some issue with O2 sensors, etc.
 
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