OBD-I Codes List

Ford 44 Secondary air system inoperative

Make
Ford (1981-1995)
Category
Powertrain - Auxiliary Emissions Controls
Severity
Check Engine Light

How to read it

Code 44 reads as 4 flashes, pause, 4 flashes on the check-engine light. Jumper the self-test input to signal return at the test connector, then run the key on engine off self test and the running self test, counting the check-engine flashes each time.

New to flash codes? The How to Read Ford EEC-IV Self-Test Codes walks through the test and what the numbers mean. The general OBD-I guide covers the rest.

What does Ford code 44 mean?

Secondary air system inoperative

Common causes of 44

  • A vacuum hose to the AIR system is damaged, blocked or connected wrong.
  • The AIR pump motor is dead or its drive belt slipped.
  • The AIR bypass or diverter solenoid failed.
  • The wiring to the AIR system is damaged.
  • The ECM cannot operate the AIR system.

How to fix 44

  1. Check the vacuum hoses to the AIR system for damage, a blockage or a wrong connection.
  2. Check the AIR pump motor and its drive belt.
  3. Check the AIR bypass and diverter solenoids and the AIR passages.
  4. Test the AIR solenoid and replace it only if it fails its own test.
  5. Test the ECM last, only after every circuit test has passed.
  6. Clear the code, then retest to confirm the AIR system runs.

Source

Source review recorded

Sources and review

Review: checked against the recorded source material.

  • EEC-IV Ford trouble code table (MIL, description, type)

    archived reference page (troublecodes.net via Wayback Machine)

    Supports: code identity and meaning

    Fetched directly. Code row matches the description used in the data file.

    https://web.archive.org/web/20030720231430id_/http://www.troublecodes.net:80/Ford/eec-iv.shtml

  • Ford EEC-IV trouble codes, Crown Victoria, Mustang, Taurus, Thunderbird 1992-1995 (code, fault location, probable cause)

    archived reference page (troublecodes.net via Wayback Machine)

    Supports: code identity and probable causes

    Independent table on the same archive site with matching code identity and additional probable causes.

    https://web.archive.org/web/20160502051413id_/http://www.troublecodes.net:80/ford/crown-victoria-mustang-cobralxgt-taurus-thunderbird-1992-1995/

  • Ford EEC-IV trouble code table: code, fault location, probable cause (Crown Victoria, Mustang, Taurus, Thunderbird 1992-1995)

    reference page (troublecodes.net)

    Supports: per-code probable causes used for the page cause list and test order

    Fetched 2026-09-30. The probable cause column is what the page lists, in source order, with the test order built from it.

    https://www.troublecodes.net/ford/crown-victoria-mustang-cobralxgt-taurus-thunderbird-1992-1995/

Last updated 2026-10-10.

Report a correction for 44. Include your vehicle, the issue and a source if you have one.

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