Hello. At 170,000 km, my VTI (without LPG) vehicle starts the fan at high level after the "depolution fault" error at the first start in the morning, it stutters and sometimes stops. In general, when I turn off the ignition, wait until the fan stops and start it again, it gets better. Only once did it not recover and the vehicle fell out of traction. Based on this situation, the thermostat (with its complete log), coil, spark plug, fan resistance and sensors, sockets were changed. But my problem was not completely cut off and continues. (I mean, with these changes, my vehicle started to eat better gas, that's all.)
The electrician said that the engine installation was also played a lot, but he said that the last two engine brains might be faulty in reference to my problem. By the way, the electrician connects the device to the device after every failure and says that there is no error code.
What do you think I should follow.Obviously, the repairmen don't come close to vti.