Hi again..

So heres whats up with my VW

Its a 2001 Jetta 4cyl 2.0L with 250 000kilo

about 3 weak ago.. after a 200kilo ride.. all of a suden .. i lost my air conditioning in the car (no more cool air.. i knew it was comming cause every week the air seem to be hotter)..

the day after i made a oil change and a filter replacement.. dint realy care about the AC...

maby 2 or 3 day after i got a check engine light .. so i took my OBD2 out and ran a test..

2 errors

1st one : P0135 O2 Heater Circuit Bank1 Sensor 1
2sd one : P1296 Engine Coolant Systeme Malfunction

So yesterday i order a G62 (green) sensor.. as i taught it could be this or the thermostat.. and to me it was easy to change this than the thermo.. and cheaper than change the O2 sensor..

now i just changed the G62 coolant sensor.. and noticed the coolant level was right on the minimum line.. so i taught it could be that to... but i dint have coolant with me yet...

made a other test with the OBD2.. the P0135 error dissapear (good thing lol as the piece would cost me about 150$ lol ).. but the P1296 error still there ...

could the coolant level would make the P1296 error pop out ? or i should realy try to change the thermostat ? (wich seem to be hard to ??? as i dont have a lift and kinda hard to change lie on the ground under my 1T jack)

or maby im not looking to change the good thing ?

If some one have a guess feel free to let me know

TY all