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2018 PORSCHE CAYENNE GTS
3.6L Twin Turbo V6•AWD•AUTOMATIC•gas•MCX.KA•turbo
1 active safety recall on this vehicle — view recalls
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Repairs0Labor490Torque709Fluid10DTC1856Battery1Maintenance0Recalls1
P1127moderate severityPowertrain

Long Term Fuel Trim System Too Rich Bank 1

on 2018 Porsche Cayenne GTS 3.6L Twin Turbo 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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