How is it that Volkswagen sagitar automatic manual transmission car will vibrate violently when it is occasionally engaged in D or R gear?

There will be severe vibration when you put D gear or reverse gear, which is called gear impact. There are many possibilities of gear collision. I won't list them for you if they are too complicated, but only the parts that are prone to this kind of fault.

First, check whether the transmission oil has deteriorated. According to the regulations, 40,000 kilometers must be replaced, or it has been replaced, but the original transmission oil is not used, which is prone to this phenomenon.

Second, check whether the electronic throttle signal is within the standard range. The wrong electronic throttle signal can also cause shift shock.

Third, check whether the gear switch is unclear when shifting gears, which leads to the inconsistency between the manual valve and the automatic control oil circuit, resulting in impact.

Fourth, check whether the idle speed is too low, which leads to the jitter caused by insufficient power when shifting gears (it is ok to clean the throttle or oil circuit for such faults).

5. The bottom rubber of the engine and automatic transmission cracked, which caused the vibration to be transmitted to the car, and the device could not absorb the vibration (new cars generally did not, except accident cars).