If you own a Porsche 993 (1994–1998 911), you know that keeping the lighting in top shape is essential for both safety and aesthetics. Replacing a burned-out bulb seems simple, but tracking down the exact part number can be frustrating. This guide provides a comprehensive list of Porsche 993 light bulb part numbers for every lighting position on the car. Whether you need a headlight bulb, a tail light bulb, or an interior bulb, you’ll find the correct OEM number here, along with practical advice for sourcing and installation.
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999-631-133-91 1999-2015 Porsche 911 Bulb
Understanding Porsche 993 Lighting
The Porsche 993 uses a mix of standard and proprietary bulbs. Unlike modern cars with integrated LED units, the 993 relies on replaceable bulbs. The most common types are H1, H4, H7, and various wedge-base and bayonet bulbs. OEM part numbers typically start with 993 or 964 followed by a series of digits. These numbers are unique to Porsche and ensure proper fitment, voltage, and brightness. While aftermarket equivalents exist, using the correct part number guarantees compatibility.
Headlight Bulb Part Numbers
The headlights on the 993 are the most frequently replaced bulbs because they burn out over time. The 993 uses separate bulbs for low beam and high beam, or combined H4 units depending on the market and option code.
Low Beam (H1 Bulb)
Most US-market 993s use an H1 bulb for low beam. The OEM part number is 993 631 031 01 (H1 12V 55W). This bulb fits the outer headlight module. For the passenger side, the part number is the same. Always replace both sides at the same time to maintain even light output.
High Beam (H1 Bulb)
The high beam also uses an H1 bulb. The OEM part number is 993 631 032 01 (H1 12V 55W). This is identical to the low beam bulb but is designated for the inner module. Some cars use an H4 bulb for both low and high beam; if your car has H4, the part number is 993 631 031 00 (H4 12V 60/55W). Check your owner's manual to confirm.
City Light / Parking Light
Many 993s have a small city light bulb inside the headlight housing. This is a 5W wedge bulb (W5W) with part number 993 631 037 00 or often cross-referenced as 12V 5W. Some use a 4W bulb (part number 993 631 036 00).
Turn Signal (Front)
The front turn signal bulb is a PY21W (single filament, 21W, amber). OEM part number 993 631 035 01 (12V 21W amber). The base is BAU15s. For clear turn signal lenses, use an amber bulb; for amber lenses, use a clear bulb with amber coating.
Tail Light & Turn Signal Bulbs
The rear lighting cluster includes tail lights, brake lights, turn signals, and reverse lights. The 993 uses separate bulbs for each function.
Tail Light / Brake Light (Dual Filament)
The rear tail light and brake light share a dual-filament bulb: P21/5W (BAY15d base). OEM part number 993 631 038 01 (12V 21/5W). This bulb has two filaments: one for tail (5W) and one for brake (21W).
Turn Signal (Rear)
The rear turn signal uses a PY21W single filament amber bulb, same as the front. Part number 993 631 035 01.
Reverse Light
Reverse lights are single-filament 21W bulbs. OEM part number 993 631 039 01 (P21W, 12V 21W). The base is BA15s.
Rear Fog Light (if equipped)
If your 993 has a rear fog light (often on the driver side for US cars), it uses a P21W bulb (21W). Part number 993 631 039 01 (same as reverse light). Some markets use a different bulb, but this is typical.
Interior & License Plate Bulbs
Interior lighting in the 993 includes dome lights, map lights, door lights, and glove box light. Most are small wedge bulbs.
Dome Light / Map Light
The dome light uses a 12V 10W double-contact wedge bulb. OEM part number 993 631 033 01 (10W). The map lights (if equipped) use the same bulb.
Door Light (Footwell)
The footwell light is a 5W wedge bulb, part number 993 631 037 00 (W5W).
Glove Box Light
Glove box light is a 5W wedge bulb, same as above.
License Plate Light
License plate bulbs are 5W wedge bulbs. Two are used, one per side. Part number 993 631 037 00 (W5W).
Fog Light Bulb Part Numbers
Front fog lights on the 993 are optional but common. They use H3 bulbs (12V 55W). OEM part number 993 631 030 00 (H3). The base is PGJ19Y1. Some aftermarket options are available, but the H3 halogen is standard.
How to Find the Right Bulb for Your 993
If your car has been modified or you're unsure, the best place to start is your owner's manual. The bulb location diagram lists the bulb type and part number. Alternatively, remove the old bulb and check the markings on the base. Most bulbs have the W number (e.g., W5W, PY21W) or H number (e.g., H1, H7) printed on them. You can also consult a Porsche dealer parts department with your VIN for a definitive list.
Another reliable method is to look for the OEM number printed on the bulb itself. It will be a 10-digit number starting with 993 or 964. If the bulb is too faded, measure the base type and compare with online resources. But crossing reference with a trusted supplier using your model year and VIN is safest.
Practical Tips for Replacement
- Always use gloves when handling halogen bulbs – oil from your skin can cause hot spots and premature failure.
- Replace bulbs in pairs – if one headlight burns out, the other is likely close behind. Matching brightness keeps the beam pattern even.
- Check the socket and wiring – corrosion or damage can cause repeated failures. Clean contacts with dielectric grease.
- Upgrade cautiously – higher wattage bulbs can overload wiring and melt connectors. Stick to OEM-spec wattage unless you upgrade the harness.
- LED conversions: The 993 can accept some LED bulbs for interior or license plate lights, but headlight LEDs require a conversion kit with cooling and canbus adapters. Be aware of potential hyperflash on turn signals (install load resistors).
Final Recommendation
For the most reliable and hassle-free replacement, order the exact OEM part numbers listed above from a Porsche parts supplier or a reputable automotive lighting retailer that carries genuine bulbs. Avoid no-name bulbs; quality matters for safety and longevity. Keep a spare set of the most common bulbs (headlight H1, tail light dual filament, and a wedge bulb) in your glove box for emergencies. Matching part numbers ensures the bulb fits, operates correctly, and meets DOT compliance. With this guide, you can confidently tackle any burned-out bulb on your Porsche 993.