Conditions for Setting the DTC

Condition 1

• The ECM detects that the front HO2S is operating too lean while the rear is operating too rich and the ECM detects that the fuel trim is at maximum control.

  Or

• The rear fuel trim, long and short term, is more than a threshold.
• After the air flow coming into the engine accumulates to more than 200 grams and the above conditions are met, this DTC sets.

Condition 2

• The ECM detects that the rear HO2S is operating too rich while commanding a lean condition.
• After the air flow coming into the engine accumulates to more than 800 grams and the above condition is met, this DTC sets.