Back to 2004 Audi A6
Help
2004 AUDI A6
3.0L V6•AWD•AUTOMATIC•gas•AVK
4 active safety recalls on this vehicle — view recalls
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Repairs0Labor504Torque2204Fluid9DTC956Battery1Maintenance0Recalls4
P1137moderate severityPowertrain

Long Term Fuel Trim System Too Lean Bank 2

on 2004 Audi A6 3.0L V6 · AWD

What this code means

The ECU detected that the long-term fuel trim for Bank 2 has reached the maximum lean correction limit. The fuel system cannot add enough fuel to compensate for the lean condition.

Symptoms

  • Check Engine Light
  • Rough idle
  • Lean misfire Bank 2
  • Hesitation
  • Reduced power

Common causes

  • Vacuum leak at Bank 2 intake
  • Clogged fuel injectors Bank 2
  • Low fuel pressure
  • Intake manifold runner flap issues
  • MAF sensor fault

Diagnostic steps

  1. Smoke test for vacuum leaks at Bank 2
  2. Compare fuel trims between banks
  3. Test fuel injector flow Bank 2
  4. Check fuel pressure
  5. Test MAF sensor output

Repair notes

Repair vacuum leaks or fuel delivery issues specific to Bank 2.

🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
As an Amazon Associate, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Other Powertrain 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 Lexus & Toyota 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 A6 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 A6 — $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 →