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Performance Engine Oils
NAPA Auxiliary Miniature Bulb T4W 12V 4W BA9s (NBU1233)

NAPA Auxiliary Miniature Bulb T4W 12V 4W BA9s (NBU1233)


NAPA Auxiliary Bulb NBU1233 - Single



NAPA Auxiliary Bulb NBU1233 - Box of 10

Box of 10


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  • Description
  • Benefits
  • Technical Info
  • Fitment / Compatibility
  • Shipping Explained

NAPA Auxiliary Miniature Bulb T4W 12V 4W BA9s (NBU1233)

General Details:

Voltage [V]12
Rated Power [W]4
Fitting PositionRear
Length [mm]9
Lamp TypeT4W
Socket TypeBA9s MCC Tub

Additional Images:

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All automotive bulbs are liable to fail and/or deteriorate over time, with their lifespan depending on several factors that include voltage, vibration, and usage. As a safety-critical part, it is important to regularly check bulbs and replace them in pairs to allow a clear, brighter view of the roads and ensure driver safety.

NAPA offers a comprehensive range of popular Halogen, Xenon HID and Auxiliary bulbs made to OE specification and always through strict quality standards.

All products in the NAPA range are manufactured to a high quality standard and engineered by an R & D team. Each bulb is quality tested throughout the production process and certified to meet several international standards including ECE regulation 37 (R37). The Quality Assurance department is regularly and independently verified by BSI, having been awarded ISO9001 for the manufacture and assembly of automotive lighting over a period of many years.

To check specific compatibility you can use our Vehicle Lookup or feel free to contact us - we are happy to help.


  • Leading brand in automotive parts; synonymous with trust, professionalism and tradition
  • Comprehensive range available of popular Halogen, HID and Auxiliary bulbs covering 96% of the UK car parc
  • Warranty on the NAPA bulb range is in line with vehicle manufacturer’s guidelines
  • Manufactured to reliable and consistent high quality standards
  • Made to OE specification
  • All NAPA bulbs are lead-free
  • NAPA headlamp bulbs are UV cut
  • Like for like replacements
  • ECE approved

Technical Information:

  • ECE Ref.: T4W
  • Voltage: 12V
  • Wattage: 4W
  • Base: BA9s

Fitment / Compatibility:

NAPA Bulb Application Guide for NBU1233:

  • Side Repeater
  • Tail
  • Number Plate
  • Front / Side


SHIPPING IS FREE* for orders of £75 and over , regardless of the weight of your order.
We've tried to keep all other shipping costs as low as we can.

Carriage starts at just £0.95 (inc VAT) for small items, with our most common courier rate set at £5.99 for orders of 5kg (enough for 5 litres of oil).

  • *Free shipping is available for UK Royal Mail, UPS Access Point™ (click & collect) and standard UK courier services (not express / priority / islands).
  • Courier surcharges mean we are unable to offer free "to the door" courier shipping from us in Cornwall up to Highlands / Grampian in Scotland - and because we send a lot of liquids, not every courier option is available to us. UPS Access Point™ (click & collect) is available as a free shipping option across Scotland, Wales and England, wherever there is a UPS Access Point™ Location.
  • Carriage charges are based on weight - please see our table of carriage costs for full details (although adding an item to your cart and viewing the calculated carriage is often easier!).
  • Priority shipping is also available.

How long will it take to get my order?

We give an estimate of delivery dates as you shop and in your basket. The vast majority of items are held in stock and dispatched from our UK warehouse and we'll do all we can to get your order to you as quickly as possible.

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