OBD Codes List

Diagnostic reference · P02AF

P02AF

Cylinder 6 - Fuel Trim at Min Limit

System
Injector circuits (P code)
Lamp
Check Engine Light
Category
Powertrain - Fuel/Air Metering

What it means

P02AF means Cylinder 6 - Fuel Trim at Min Limit.

Check these first

  • A leaking or clogged cylinder 6 fuel injector
  • Too high fuel pressure
  • A faulty oxygen sensor reading rich
  • A vacuum leak at the cylinder 6 intake runner
  • A faulty fuel pressure regulator

What to do next

  1. Read the long and short term fuel trim on a scan tool
  2. Run a fuel system leak down test on cylinder 6
  3. Check fuel pressure and the pressure regulator
  4. Compare the oxygen sensor reading to a known good one
  5. Replace injector 6 if it leaks down
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.