Scion xB Parking Light Bulb Size

Additional Notes

• The Scion xB parking light specifications reference three distinct bulb types across its production years: the 168, 1157NA, and 1034NA, all of which conform to ANSI standards recognized in the United States and Canada.
• The 168 bulb is a T10 miniature wedge type rated at 12V and 4.9W. Its wedge base design means it requires no separate socket locking mechanism, as the bulb body itself acts as the retention element.
• The Scion xB (2011-2015) uses the 168 bulb for the parking light position, making it the only model year range in these specifications to use a single-filament wedge-type bulb rather than a dual-filament bayonet type.
• The 1157NA and 1034NA bulbs both use the BAY15d bayonet base and share a 12V, 21W/5W dual-filament configuration. The 1034NA is a variant of the 1157 series, with the natural amber glass coating present on both types serving to produce an amber output without a separate colored lens.
• Because the 1034NA is a variant of the 1157 series rather than an identical replacement, substituting one for the other without confirming the specific fitment year of the Scion xB carries an interchangeability risk, even though the base type is the same on both bulbs.
• The 2010 xB uses the 1157NA, while the 2008 xB also uses the 1157NA, placing these two non-consecutive years in the same bulb specification despite the years between them using a different type.
• The 2004-2006 and 2009 model years share the 1034NA specification, grouping the earliest and one mid-range production year under the same parking light bulb requirement.
• The shift from dual-filament bayonet bulbs in earlier model years to the single-filament wedge-type 168 in 2011 reflects a change in the socket and housing design of the parking light assembly, meaning earlier and later assemblies are not interchangeable.