P0128 Volkswagen -

Question

VW showed P0128 then followed by P0733

Answer 1

P0128 Coolant thermostat malfunction

P0733 Third gear incorect gear ratio

Third gear ration start by checking the transmission fluid condition and change if necessary, Gear ration error on VW are usually caused due to the speed sensor, As for P0128 a check for coolant leaks or low low coolant level if it is okay repalce the thermostat.