CEL 1128/1130 then CEL went off but car cut off

[joshua6060]

Hi, I have had a CEL on for about two months(only drove the car to autozone to get the codes once CEL came on, they told me 1128/1130, I know its possible oxygen sensors) I decided to bring the car to my local mechanic, he puts the car on his scanner, and came up with the same codes(1128 and 1130) the mechanic also noticed some white-ish/blue-ish smoke come from the exhaust at start up and when i tapped the pedal, He then asked me to return with the car on Monday when he had room to take it in. On my way from the mechanics garage about two blocks away the car stopped, it restarted but noticed a slight flicker of the oil light, drove a few blocks and it stopped again, started up again and the CEL was gone. And no other warning lights were on. Confused - any guidance/advice/similar experiences and cost to repair?

Confused