The Maserati Quattroporte parking light utilizes bulb size 89 and bulb size P21/5W for the lighting components. Data for the specified vehicle covers the range from 1984 through 2012.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Maserati Quattroporte front parking light specifications cover three distinct bulb types across the listed model years: the 12961, the P21/5W, and the 89.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base and rated at 12V, 5W. It is specified for the Maserati Quattroporte across the 2004-2008 model years.
The T10 wedge base is a push-in connector type, meaning the bulb is retained by friction rather than a twist-lock or bayonet mechanism.
The P21/5W is an ECE-standard dual-filament signalling bulb with a BAY15d bayonet base, rated at 12V with filaments at 21W and 5W respectively. It is specified for the 2009-2012 model years.
The BAY15d base features two offset pins at different heights, which prevents incorrect single-filament bulbs from being inserted in place of a dual-filament unit. Substituting a single-filament bulb in a P21/5W socket would result in loss of one lighting function.
The P21/5W and the 12961 are not interchangeable. They differ in base type, wattage, filament count, and regulatory standard, making cross-year substitution between the 2004-2008 and 2009-2012 groups incompatible.
The 89 is an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V, 13W. It is specified for the 1984-1986 model years and is described as a lower wattage variant of the 1156 bulb.
The BA15s base used by the 89 bulb is a single-contact bayonet fitting, distinct from the dual-contact BAY15d base of the P21/5W. The two bases are physically incompatible despite both being bayonet-style connectors.
The 12961 at 5W, the 89 at 13W, and the P21/5W at 21W/5W represent three different power draws. Wattage compatibility with the vehicle's socket and wiring is a relevant consideration when sourcing replacements.
The shift from the ANSI-standard 89 bulb in the 1984-1986 years to the ECE-standard P21/5W in the 2009-2012 years reflects a transition between North American and international lighting standards across different generations of the Quattroporte.