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2009 AUDI A4
3.2L V6•AWD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor506Torque3228Fluid9DTC1087Battery1Maintenance0Recalls2
P1136moderate severityPowertrain

Long Term Fuel Trim System Too Rich Bank 2

on 2009 Audi A4 3.2L V6 · AWD

What this code means

The ECU detected that the long-term fuel trim for Bank 2 has exceeded the maximum rich correction limit. The adaptive fuel system has exhausted its ability to lean out the mixture on Bank 2.

Symptoms

  • Check Engine Light
  • Rich exhaust from Bank 2
  • Poor fuel economy
  • Rough idle
  • Black smoke

Common causes

  • Leaking fuel injectors Bank 2
  • O2 sensor Bank 2 faulty
  • Fuel pressure too high
  • PCV system fault
  • Coolant temp sensor issue

Diagnostic steps

  1. Compare fuel trims Bank 1 vs Bank 2
  2. Test O2 sensor Bank 2
  3. Check fuel pressure
  4. Inspect PCV system
  5. Test coolant temperature sensor

Repair notes

Repair the cause of excess fuel delivery on Bank 2.

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🔧 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.
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