522655-0 – Rich Engine Operation – Hyster Forklift Code

This code appears when the oxygen sensor detects the fuel ratio has too little air and too much fuel. Something in the fuel system is causing the air and fuel to mix incorrectly.  

Trouble shooting should include the following:

  • Dirty air filter
  • Fuel is bad
  • Thin air at high altitudes
  • Fuel injector issues
  • Fuel filter dirty and clogged
  • Vacuum leak
  • Faulty LPG vaporizer
  • Faulty LPG regulator
  • Faulty LPG mixer

One thought on “522655-0 – Rich Engine Operation – Hyster Forklift Code”

  1. Andy Guild

    Andy Guild

    We had this issue and went through all the trouble shooting steps, including swapping the electronic pressure regulator and the mixer. When we replaced the LPG vaporizer the code went away. Sometimes the LPG vaporizers develop internal leaks.

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