Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.