Audi A4 Electric Steering Rack Repair & Reconditioning
Audi A4 RHD Electric Steering Rack Specialists
Pro Power Steering diagnoses, repairs and reconditions Audi A4 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 A4 Generations and Steering Rack Changes
B8 / 8K — 2008–2015/16
Three-contact, six-contact, standard and dynamic families exist.
B9 / 8W — 2015–present
New rack architecture; standard and dynamic units must be separated.
Audi A4 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 rack label, the VIN, right-hand-drive specification, connector count, PR code and software before supply or fitting.
B8 / 8K non-dynamic RHD references
8K2 423 105; 8K2 423 055; 8K2 423 055 AA; 8K2 423 055 S; 8K2 423 055 AC; 8K2 423 055 AD; 8K2 423 055 AK; 8K2 423 055 AJ; 8K2 423 055 AS; 8K2 423 055 AT; 8K2 423 055 BG; 8K2 423 055 BH; 8K2 423 055 BN; 8K2 423 055 BR; 8K2 423 055 BP; 8K2 423 055 BS.
B8 / 8K alternative and dynamic references
8K2 423 055 BT; 8K2 423 055 AL; 8K2 423 055 BA; 8K2 423 055 BJ; 8K2 423 055 BQ; 8K2 423 055 P; 8K2 423 055 T; 8K2 423 055 AE; 8K2 423 055 AN; 8K2 423 055 CD. Dynamic steering normally uses PR code 1N8; non-dynamic steering normally uses QZ7.
B9 / 8W non-dynamic RHD references
8W2 423 055 N; 8W2 423 055 Q; 8W2 423 055 S; 8W2 423 055 AC; 8W2 423 055 AE; 8W2 423 055 AG; 8W2 423 055 AJ. Published ATG cross-reference: Bosch 7828 974 697.
B9 / 8W dynamic and alternative references
8W2 423 055 P; 8W2 423 055 R; 8W2 423 055 T; 8W2 423 055 AD; 8W2 423 055 AF; 8W2 423 055 AH; 8W2 423 055 AK. Confirm 1N8/QZ7 and the complete original label before ordering.
Standard, Dynamic and Lock-to-Lock Differences
Some standard systems are roughly 2.9 turns lock-to-lock and some dynamic systems about 2.5. PR code and original data remain authoritative.
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 A4 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 A4 Steering Rack
Send the VIN, registration, fault codes and rack-label photographs for an accurate assessment.
