Hi mate.
P1198 could be a fault with an injector or possibly a fuel rail pressure sensor.
p1113 is to do with air temp entering the engine

Neither of these would be fixed by changing the turbo. As far as i remember alot of diesel french stuff has problems with injectors. I was a renault senior technician for 8 years, so know that they did. Best thing to do would be to do a leak of test on the injectors.
When i go back to work monday, i will see if i have any adapters to fit the injectors, if i have i will send you them and instructions on how to do it at home, save paying garage bills.

 

many thanks for that.

 

here are the codes

P1113 Intake air temperature (IAT) sensor circuit open/short

P1198 Pump rotor control Underfuelling - SID801 - Diesel high pressure monitoring. Flow regulator at stop.

 

could these bring on the engine management light.

 

need a airflow meter for air temp fault. and a pressure regulator on the back of the hp pump.also check the loom back through from pressure reg as they tend to rot and break and if its a 110 rhs? open your fuel filter and see if you have aload of brass filing in the bottom.