Back to 2004 Audi S4
Help
2004 AUDI S4
4.2L V8•AWD•AUTOMATIC•gas•BBK
1 active safety recall on this vehicle — view recalls
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Repairs0Labor497Torque3159Fluid10DTC956Battery1Maintenance0Recalls1
U0125high severityNetwork

Lost Communication with Multi-axis Acceleration Sensor

on 2004 Audi S4 4.2L V8 · AWD

What this code means

Cannot communicate with the multi-axis accelerometer module used for stability and rollover detection.

Symptoms

  • Stability control disabled
  • Rollover protection disabled
  • ESC warning light on

Common causes

  • Multi-axis sensor failure
  • CAN bus wiring issue
  • Module power loss
  • Sensor damage from impact

Diagnostic steps

  1. Check sensor module fuse
  2. Test power and ground
  3. Inspect CAN wiring
  4. Check sensor for physical damage
  5. Test sensor output

Repair notes

Multi-axis sensors are used in rollover protection systems. Critical safety component.

🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITE
Shop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Other Network codes on this vehicle

🔌 Need this data in your app? It's all in the free API →
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
Stuck on this repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
Share:XRedditFBWhatsAppThreadsEmail
⚠ STILL BEHIND THE PAYWALL
The 2004 Audi S4 repair data is incomplete because no one has sponsored it yet. For $99, we generate the full step-by-step procedures, then fact-check them with a second AI pass and your expert review. Your name on every procedure, permanently.
The same data would cost $169/mo from Mitchell1 or $30/year from ALLDATAdiy — and you'd be renting access, not freeing it. Sponsor once, free forever.
Sponsor the Audi S4 — $99 →
Building an app?
Free API access to all this data — 10 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included.
Try ShopBase →