Lincoln Mark LT P0403:EGR→ Circuit Malfunction

P0403 is a very common trouble code. It is a generic code, which means that it has the same meaning for the Lincoln Mark LT as it would any other vehicle. It affects the EGR (Exhaust Gas Recirculation System and technically means: P0403: EGR→ Circuit Malfunction A circuit malfunction implies that there is a wiring … Read more

Lincoln Mark LT P0404: EGR Circuit → Range/Performance

With the Lincoln Mark LT, P0404 is going to have the same meaning as it would in any other vehicle. It’s a generic powertrain code that stands for: P0404: EGR Circuit → Range/Performance While there are several issues that can throw the P0404 code in the Mark LT, the most common issue is either going … Read more

Lincoln Mark LT P0131: Meaning, Causes, How to Fix

The P0131 code is an OBD-II diagnostic trouble code that indicates low voltage in the Lincoln Mark LT’s Oxygen (O2) sensor circuit for Bank 1, Sensor 1 (B1S1). This sensor plays a crucial role in maintaining optimal engine performance by detecting the air-fuel ratio in the exhaust, then sending this data to the Mark LT’s … Read more