Engine P1131 Ford Code
The Ford P1131 engine code signals an issue with the Heated Oxygen Sensor (HO2S) in Bank 1 Sensor 1, specifically indicating a lack of switching or a lean condition. This diagnostic trouble code (DTC) often points to problems impacting fuel trim, potentially leading to poor fuel economy, increased emissions, or rough engine performance. It's crucial to diagnose the root cause, which could range from a faulty O2 sensor to vacuum leaks or fuel delivery issues.