Conditions for Setting the DTC

O2S1 voltage is less than 0.35 volts in Power Enrichment (PE) mode.
Engine is operating in Closed Loop and in PE mode.
Engine Coolant Temperature (ECT) is greater than 60°C (140°F).
System voltage is greater than 10 volts.
Air/Fuel ration is less than or equal to 13.5:1.
DTCs P0106, P0107, P0108, P0117, P0118, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0300, P0336, P0337, P0351, P0352, P0401, P0402, P0404, P0405, P0406, P0443, P0488, P0496, P0502, P0506, and P0507 are not set.
2 second delay after in PE mode.