DTC P0130: O2S1 Circuit Closed-Loop Performance: Description

When vehicle is first started, engine operates in an open loop operation, ignoring oxygen sensor signal and calculating air/fuel ratio based on inputs from Engine Coolant Temperature (ECT), the Throttle Position (TP) and Manifold Absolute Pressure (MAP) sensors only. PCM will begin by using oxygen sensor signal for controlling fuel delivery (closed loop) when the following conditions are met:

• Engine has run a minimum amount of time based on ECT at engine start up.
• Oxygen Sensor (O2S1) has a varying voltage output showing that it is hot enough to operate properly.
• ECT has increased a minimum amount based on ECT at engine start up.