TSB ASI-44664 — Ford Service bulletin

ASI-44664 is a service bulletin on file with NHTSA for 2 Ford models, 2008–2010 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.

What the bulletin says. FORD: THERE ARE EXHAUST LEAKS, CAUSED BY WARPED EXHAUST MANIFOLD, EXPERIENCE BY DIESEL ENGINE. MODEL 2008-10 F SUPER DUTY.

NHTSA's own summary of the document, quoted from the public manufacturer-communications file.

1Document filed
2Vehicles named
3Model years

Vehicles and model years ASI-44664 names

VehicleModel years
Ford F-250 2008, 2009, 2010
Ford F-350 2008, 2009, 2010

Every document filed under ASI-44664

Document IDFiledType
ASI-44664 August 1, 2014 Service bulletin

What ASI-44664 covers

Engine — the component vocabulary NHTSA files this communication under.

← All Ford F-250 TSB years TSB lookup by model

Questions buyers ask

What is TSB ASI-44664?

ASI-44664 is a service bulletin filed with NHTSA by Ford, covering 2 Ford models across the 2008–2010 model years. NHTSA's summary reads: FORD: THERE ARE EXHAUST LEAKS, CAUSED BY WARPED EXHAUST MANIFOLD, EXPERIENCE BY DIESEL ENGINE. MODEL 2008-10 F SUPER DUTY.

Which vehicles does ASI-44664 cover?

NHTSA's file names Ford F-250 (2008–2010); Ford F-350 (2008–2010). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.

Is TSB ASI-44664 a recall, and is the repair free?

No. ASI-44664 is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.

How do I get the full text of ASI-44664?

Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under ASI-44664, its date, and NHTSA's own summary from the public file.

Data updated 2026-08-20 from NHTSA's public records

Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under ASI-44664. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.