What is the reason for the shaking of Volkswagen Sagitar after wading through water?

[RileyMarie]

Volkswagen Sagitar shaking after wading through water is caused by severe carbon deposits in the engine. Reasons for car shaking: When the car starts shaking, it increases the internal operating resistance of the engine, so the ECU will inject more fuel, which can cause some shaking. Additionally, if the oxygen sensor has not reached its working temperature during startup, it can also lead to engine shaking. Reasons for car shaking in winter: Cold start shaking for two seconds in winter is due to low temperatures. The exhaust pipe temperature also decreases, and the oxygen sensor has a minimum working temperature. As a result, the vehicle's ECU cannot obtain accurate data, leading to errors in ignition and fuel-air mixture control, which weakens the vehicle's power output and causes shaking.