Ford Mustang service engine soon light and fuel gauge drops due to passenger side sending unit issue on Ford Mustang

Some Ford Mustang owners report experiencing issues with the service engine soon light and a dropping fuel gauge, often attributed to problems with the passenger side fuel sending unit. These owners note that a faulty sending unit can lead to inaccurate fuel gauge readings, which may trigger the service engine soon light. To diagnose the issue, it is recommended to check for common problems such as a dirty Mass Air Flow (MAF) sensor or loose wiring, and to use a scanner to pull diagnostic codes for further insights. Many owners have found that replacing the malfunctioning fuel sending unit resolves these issues, restoring accurate fuel level readings and improving overall engine performance.