What does P1548 mean on a Ford?

P1548. Engine Air Filter Restriction. Applies to Ford models with filter restriction monitoring.

What causes P1548 on a Ford?

Clogged air filter Collapsed intake duct Aftermarket filter with excessive restriction Debris packed in the airbox Faulty restriction sensor

How do I fix P1548 on a Ford?

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

Code

P1548

Engine Air Filter Restriction

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: Ford models with filter restriction monitoring
Related: P0101 Mass or Volume Air Flow Circuit Range/Performance Problem on OBD Codes List

Findings, check these first

Clogged air filter
Collapsed intake duct
Aftermarket filter with excessive restriction
Debris packed in the airbox
Faulty restriction sensor

Standard procedure

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

Code lookup

Type a code above, or start from a symptom or a common code.

Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.

Sources and review

Review: checked against the recorded source material.

OBDII.pro: P1548 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1548: ENGINE AIR FILTER RESTRICTION
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.
P1548 FORD Code: Meaning, Causes, and Symptoms | OBD2 Codes
live reference page (obd2-codes.co)
Supports: Ford meaning for P1548: Engine Air Filter Restriction
Fetched directly. obd2-codes.co phrasing matches the engine-codes family, so it counts as one publisher.

Last updated 2026-09-06.

Report a correction for P1548. Include your vehicle, the issue and a source if you have one.