Aston.club Independent ownership knowledge

Spark plugs

V12 · 6.0-litre naturally aspirated · 2004–2016

Part numbers and fitment

Check the exact plug designation. Heat range, thread and electrode design matter; engine size alone is not a part reference.

NGK original-equipment spark plug

Part link

Verified OE cross-reference

Aston Martin
CD33-12405-AACD33-12405-AA-PK
NGK
SITR7A11G94949
Application
DB9 V12. Later DB9 V12; catalogue reference CD33-12405-AA.
Years
2013–2016
Full-set quantity
12

CD33-12405-AA-PK is a four-plug pack. A full set is 12 plugs: three Aston Martin packs. NGK 94949 is the stock number for SITR7A11G; check the seller’s pack size.

Before ordering

  • Only the listed 2013–2016 application is covered. Confirm engine, build date and market.
  • Use this match only for a VIN-specific catalogue reference CD33-12405-AA or four-plug pack CD33-12405-AA-PK. Earlier versions and other generations may use different plugs.
  • Confirm the current catalogue revision before ordering. Modified engines require a separate specification.
Evidence for this match

NGK maps CD33-12405-AA to SITR7A11G (94949). The genuine Aston listing identifies the NGK four-plug pack. Model-specific years and engine restrictions limit the application; a broad supplier model list does not establish every variant.

Reviewed

Sources and research

The NGK match is limited to the listed engine and years, and to cars whose VIN-specific catalogue specifies CD33-12405-AA. A full set contains 12 plugs.

Confirm the reference against your car’s VIN and current parts catalogue. Illustrations are for orientation. Linked evidence supports researched records; owner-confirmed references state the supplied source and compatibility confirmation.