P1548 Engine Air Filter Restriction
What does P1548 mean on a Ford?
P1548 — Engine Air Filter Restriction. This Ford-enhanced code applies to Ford models with filter restriction monitoring.
Common causes of P1548
- Clogged air filter
- Collapsed intake duct
- Aftermarket filter with excessive restriction
- Debris packed in the airbox
- Faulty restriction sensor
How to fix P1548
- Replace the air filter
- Inspect the intake duct for collapse
- Clear debris from the airbox
- Verify MAF readings return to spec
- Test the restriction sensor if the code persists