Toyota Sienna 2004–2006 — technical service bulletin
Bulletin 05506 · NHTSA communication 10022731 · issued Sep 7, 2007
Technical service bulletin
communication type
Engine and Engine Cooling
component
2004–2006
model years
3
vehicle entries
Official summary
Engine pinging or knocking noise. *kb
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.