Audi A8 Electric Steering Rack Repair & Reconditioning
Audi A8 RHD Electric Steering Rack Specialists
Pro Power Steering diagnoses, repairs and reconditions Audi A8 electric steering racks for private customers, garages, workshops and trade partners across the UK. We can assess the original unit or identify a suitable replacement from the VIN and rack label.
Audi A8 Generations and Steering Rack Changes
D4 / 4H — 2010–2017
Early electric-assist generation with specification changes.
D5 / 4N — 2017–present
Later architecture including S8 and assistance variants.
Audi A8 RHD Part Numbers and Rack Families
These complete references are identification guides collected from specialist catalogues. A shared base number does not prove interchangeability: confirm every character on the original label, the VIN, right-hand-drive specification, connector count, PR code and software before supply or fitting.
A8 D4 / 4H non-dynamic RHD references
4G2 423 055 AA; 4G2 423 055 AH; 4G2 423 055 AN; 4G2 423 055 AR; 4G2 423 055 BD; 4G2 423 055 BM; 4G2 423 055 CR; 4G2 423 055 DD; 4G2 423 055 CB; 4G2 423 055 DA; 4G2 423 055 DG; 4G2 423 055 BK.
A8 D4 dynamic and alternative references
4G2 423 055 AT; 4G2 423 055 BQ; 4G2 423 055 CT; 4G2 423 055 DF; 4G2 423 055 DT. Confirm engine/PR-code restrictions, especially W12 and 4.2 TDI applications.
A8 D5 / 4N RHD references
4N2 423 053 C; 4N2 423 053 E; 4N2 423 053 F; 4N2 423 053 H; 4N2 423 053 J; 4N2 423 053 K; 4N2 423 053 L; 4N2 423 053 M; 4N2 423 053 P.
Standard, Dynamic and Lock-to-Lock Differences
A8/S8 variants can have faster steering. Measure only as a secondary check and confirm the original number and build data.
Safety first: never force an incompatible rack through calibration. The wrong steering type or travel can prevent end-stop learning and leave steering-angle faults.
Common Audi A8 Electric Steering Faults
Heavy or intermittent steering
Assistance may disappear, return after restarting, or become heavier in one direction.
Warning lights and stored codes
Enquiries include C10AC07, C10ACF0, B200000, 03803 and steering-angle or end-stop faults. Diagnosis is required before condemning the rack.
Noise, play or water ingress
Mechanical wear, corrosion, damaged boots, seals or electronics can cause noise, looseness or unreliable assistance.
Calibration after fitting
Wheel alignment, centred track rods, steering-angle checks and lock-stop learning may be required.
Our Repair and Identification Process
Frequently Asked Questions
Can you identify it from the registration?
It helps, but VIN and rack-label photographs are normally required because mid-year changes are common.
Will it need programming?
Many correctly prepared racks avoid full dealer programming, but some require coding transfer, initialisation or end-stop learning.
Do you serve trade customers?
Yes. Garages, workshops and resellers are welcome, as are private customers.
What warranty applies?
Reconditioned steering work includes a 12-month warranty. For resellers, the start date can reflect documented onward sale or fitment when agreed.
Audi EPS overview · Electric steering rack services · Trade services
Ask About Your Audi A8 Steering Rack
Send the VIN, registration, fault codes and rack-label photographs for an accurate assessment.
