Facelift Twitching from the rear

vw754

vw754

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2019 , Rs3.
If in dynamic or I put my foot down hard , car starts twitching/ snaking...... exactly like a snake would side to side , haldex and diff oil been changed , could this be a bad shock absorber?
 
A quick search came up with this answer:

DSG Snaking Under Full Power in Audi RS3 8V
The sensation of "snaking" or erratic power delivery under full throttle in an Audi RS3 8V with a DSG transmission is often linked to electronic traction control or Haldex AWD system interference, particularly when traction control is enabled.

  • Haldex AWD System: The Haldex system can cause a jerking or snaking sensation during hard acceleration if it’s not properly calibrated or if there’s a software/communication issue. Disabling traction control (TCS) often resolves the symptom, as noted in user reports where the issue disappears when TCS is turned off.
  • Traction Control (TCS) and Stability Control: These systems can modulate power delivery and intervene aggressively during hard launches, especially on low-grip surfaces. This can result in a jerky, snaking behavior.
  • Software and Calibration: A DSG transmission reset or relearn procedure (using tools like VCDS or OBD11) may be needed to recalibrate the transmission’s adaptive learning, which can improve smoothness under load.
  • Mechatronic Unit or Clutch Pack Issues: While less likely to cause snaking specifically under full power, a failing mechatronic unit or worn clutch pack can contribute to inconsistent power delivery and should be ruled out via diagnostic scanning.
  • Worn or Faulty Engine/Transmission Mounts: If mounts are degraded, they can allow excessive movement under load, leading to perceived snaking. Replacing with performance mounts (e.g., BFI Stage 1) has resolved similar symptoms in some cases.
Recommendation:
  • First, disable traction control to test if the snaking stops.
  • Perform a DSG relearn/reset using diagnostic software.
  • Have the Haldex system and mechatronic unit scanned for fault codes.
  • Check engine and transmission mounts for wear.
  • If the issue persists, consult a specialist with DSG expertise—especially if the car has aftermarket tuning (e.g., Stage 2+ maps), which can exacerbate control system behavior
Click to expand...
 
Done all the above , serviced haldex , done pump relearn , no fault codes.
No difference.
Noticed a thud when coming off speed humps rear left .... could a shock absorber cause it ?
 
Not sure about the software cars a 2019.
Cars standard , yes has mag ride ....saloon.
 
noise from one corner could be the shockabsorber, but with you hvng magride, it should log a DTC if the shock is slow to respond. unless it's a mechanical fault within the hydraulic part of the shockabsorber... that won't be logged. IMO i would have it looked at to make sure it's not a shock causing it.
 
northpole said:
noise from one corner could be the shockabsorber, but with you hvng magride, it should log a DTC if the shock is slow to respond. unless it's a mechanical fault within the hydraulic part of the shockabsorber... that won't be logged. IMO i would have it looked at to make sure it's not a shock causing it.
Click to expand...
Ok , thanks for that , not DTC logged , will get it checked out
 
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vw754 said:
Not sure about the software cars a 2019.
Cars standard , yes has mag ride ....saloon.
Click to expand...
have the vehicle:

1)tracked and aligned
2)mag ride calibration
3)apply software updates to any related control module /s.

I offer 2 and 3 if you are in or around London.
 
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I pushed car down today a few times from the back , the left side felt a lot softer compared to the right side....felt easier to Push down
 
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