Don't worry .OK, I got 4 codes, I'm not sure I'm much the wiser...
P0141 - 02 Sensor heater, Circuit bank 1 sensor 2
P1141 - DTC definition not found.
P0136 - 02 Sensor Circuit bank 1 sensor 2
P0115 Engine coolant temp senor 1 circuit.
Sensor heater = lamdba?
Not found is worrying, I specified Fiat..
The engine temp gauge seems to work properly.
O2 means oxygen , so O2 sensor = oxygen sensor which is another name for lambda sensor.
You have a 4 cylinder in line engine so you only have bank 1.
O2 sensor 2 is the sensor after the cat.