help with odd problem

[sbrewer]

I had engine replaced in a 2002 Sentra. About a month later, I flipped the car(very lucky..no injuries). The car was towed home and fired right up however it sat for a few months (long story) then we had the windshield replaced and back on the road. The car ran great for about 10 miles or so, then started slowly losing speed and finally cut off. Smoke was coming from under the hood. After about 30 minutes the car fired up and ran fine. Days later drove the car again and went about 50 miles or so and the same thing happened this time the ses light came on. Advanced Auto says 2 codes....o2 senser(did not say which one) and temperature not coming up to right temp(said could be stuck thermostat)
Question...could the o2 senser cause the odd problem of stalling and smoking then running fine or could this be something from flipping the car? Any ideas would be greatly appreciated. Update on codes...po128 & po430, could the car flipping damage the catalytic converter?
thanks
sbrewer

[boyrs]

DTC No.
P0128
0128

Trouble diagnosis name:
Thermostat function

DTC detecting condition:
The engine coolant temperature does not
reach to specified temperature even though
the engine has run long enough.

Possible cause:

Thermostat function

Leakage from sealing portion of thermostat

Engine coolant temperature sensor

DTC No.
P0420 (Bank 1) -front
P0430 (Bank 2) -rear

Malfunction is detected when ...

Three way catalyst does not operate properly.

Three way catalyst does not have enough oxygen storage
capacity.

Check Items (Possible Cause):

Three way catalyst

Exhaust tube

Intake air leaks

Injectors

Injector leaks

Spark plug

Improper ignition timing


glad to hear you walked away from that crash. sorry to hear about your car, something like that can cause a whole mess of problems... stalling and black smoke could mean you're burning oil. if you smell gas when stalling, it could be the MAF.