Hi everyone, I'm new at this forum and I'm love with my recently bought Leon. Seat Leon MK1 1.9 TDI 66kw manual transmission. The vehicle doesn't go above 120km/h and 3000rpm. I went to few repair services and they weren't able to resolve this issue. I've replaced the MAF sensor, and there was small speed up but on the lower gears (better start). I've connected to VAG-COM and these are the engine errors: 2 Faults Found: 18062 - Please check DTC Memory of Instrument Cluster P1654 - 35-10 - - - Intermittent 17945 - Fuel Shutoff Solenoid (N109): Malfunction P1537 - 35-00 - - The last repair service, after playing a little bit with connectors, disconnected the Coolant Temperature Sensor and clear the errors. After this, the vehicle was running great. I was able to feel it the turbo running on my engine. But the repair service wasn't able to fix the issue with the coolant sensor and left me only with finding the cause of power loss, not resolving the issue. I've connected to VAG-COM again: 2 Faults Found: 18062 - Please check DTC Memory of Instrument Cluster P1654 - 35-10 - - - Intermittent 17664 - Engine Coolant Temp Sensor (G62): Open or Short to Plus P1256 - 35-10 - - - Intermittent The previous error (for shutoff solenoid) was dismissed. I've played few times with connecting and disconnecting the coolant sensor. There were same results: If the coolant sensor is attached, the car have power loss, and on starting the engine it's a little bit noisy (1 second) make some black smoke. It went to 1100 RPM and then back to 900 RPM. If the coolant sensor is detached, the car is going great, no black smoke no noise on start. The coolant sensor was replaced previously. Any ideas of what can cause the issue?