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1997 AUDI A6
2.8L V6•AWD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor550Torque2368Fluid8DTC638Battery1Maintenance0Recalls2
P1127moderate severityPowertrain

Long Term Fuel Trim System Too Rich Bank 1

on 1997 Audi A6 2.8L V6 · AWD

What this code means

The ECU detected that the long-term fuel trim for Bank 1 has exceeded the maximum rich correction limit. The engine is consistently receiving too much fuel and the adaptive system cannot compensate further.

Symptoms

  • Check Engine Light
  • Rich exhaust odor
  • Black exhaust smoke
  • Poor fuel economy
  • Rough idle

Common causes

  • Leaking fuel injectors
  • Faulty fuel pressure regulator (excess pressure)
  • O2 sensor reading false lean
  • EVAP purge valve stuck open
  • Coolant temperature sensor reading colder than actual

Diagnostic steps

  1. Monitor long-term and short-term fuel trims
  2. Test O2 sensor response time
  3. Check fuel pressure with gauge
  4. Inspect EVAP purge valve
  5. Test coolant temperature sensor

Repair notes

Identify and repair the root cause of excess fuel delivery on Bank 1.

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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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