Let's face it, burnt-out light bulbs are a pain. And when it happens to your 2004 Subaru WRX, knowing exactly which bulb you need is crucial for a quick and hassle-free fix. This guide will walk you through all the light bulb sizes for your beloved WRX, ensuring you get the right replacement every time and get back on the road safely.
Why Knowing Your Bulb Sizes Matters (More Than You Think!)
Beyond simply illuminating the road ahead, your car's lights play a vital role in safety. Correctly sized and functioning bulbs ensure other drivers can see you, and that you can see them. Using the wrong bulb can lead to dim lighting, improper fitment (potentially damaging the housing), and even electrical issues. Plus, let's be honest, nobody wants to be pulled over for a faulty headlight.
Cracking the Code: Decoding the 2004 WRX Light Bulb Chart
Here’s a comprehensive breakdown of the light bulb sizes you’ll need for your 2004 Subaru WRX. Keep this list handy for future reference when that dreaded bulb burnout happens!
- Headlights (Low Beam): 9007
- Headlights (High Beam): 9007
- Front Turn Signal Lights: 1157A
- Rear Turn Signal Lights: 1156A
- Tail Lights: 1157
- Brake Lights: 1157
- Back-Up Lights: 1156
- Fog Lights: H3
- License Plate Lights: 194
- Side Marker Lights (Front): 194
- Side Marker Lights (Rear): 194
- Interior Dome Light: DE3175
- Map Lights: 194
- Glove Box Light: 194
- Trunk/Cargo Area Light: 194
Important Note: While this list is generally accurate for the 2004 WRX, variations can occur depending on the trim level and any aftermarket modifications. Always double-check the owner's manual or the bulb itself before purchasing a replacement.
Diving Deeper: Headlights (Low & High Beam - 9007)
The 9007 bulb serves double duty in the 2004 WRX, handling both low and high beam functions within the same bulb. This is a dual-filament bulb, meaning it contains two separate filaments: one for low beam and one for high beam. When replacing a 9007 bulb, consider upgrading to a higher-quality bulb for improved brightness and longevity. Investing in a reputable brand can make a significant difference in visibility, especially during nighttime driving.
Pro Tip: When handling headlight bulbs, avoid touching the glass with your bare hands. The oils from your skin can create hotspots and shorten the bulb's lifespan. Use gloves or a clean cloth to handle the bulb.
Blinking Bright: Turn Signal Lights (Front - 1157A, Rear - 1156A)
Turn signal lights are crucial for communicating your intentions to other drivers. The front turn signals on the 2004 WRX use an 1157A bulb, while the rear uses an 1156A. The "A" designation in 1157A and 1156A signifies an amber bulb, which is the required color for turn signals.
What's the difference between 1157 and 1157A? The 1157 is a dual-filament bulb typically used for brake and tail lights, while the 1157A is a single filament bulb specifically designed for turn signals and is amber colored. Similarly, the 1156 is a single filament bulb, whereas the 1156A is amber colored.
Upgrade Option: Some owners opt for LED turn signal bulbs. If you choose to do so, you'll likely need to install load resistors to prevent hyper-flashing (when the turn signals blink rapidly). This is because LEDs draw significantly less power than traditional incandescent bulbs, which can confuse the car's electrical system.
Stop! Tail and Brake Lights (1157)
The tail and brake lights share the same bulb type: 1157. This is a dual-filament bulb, with one filament for the tail light function (dimmer) and another for the brake light function (brighter). A properly functioning brake light is essential for preventing accidents.
Quick Test: Have a friend stand behind your car while you press the brake pedal. Verify that both brake lights illuminate brightly and evenly.
Illuminating the Rear: Back-Up Lights (1156)
Back-up lights are essential for visibility when reversing. The 2004 WRX uses an 1156 bulb for this function. Replacing a burnt-out back-up light is a simple and important safety measure.
Cutting Through the Fog: Fog Lights (H3)
Fog lights provide enhanced visibility in foggy or inclement weather. The 2004 WRX uses an H3 bulb for the fog lights.
Installation Tip: Be careful when installing H3 bulbs, as they can be fragile. Avoid touching the glass with your bare hands.
Small But Mighty: License Plate, Side Marker, Interior Lights (194, DE3175)
These smaller bulbs play a supporting role, ensuring your car is visible and providing interior illumination. The 194 bulb is used for license plate lights, front and rear side marker lights, map lights, and glove box light. The DE3175 is used for the interior dome light.
Easy Upgrade: Many owners upgrade these bulbs to LEDs for a brighter, more modern look. LED replacements for 194 and DE3175 bulbs are widely available.
Finding the Right Bulbs: Where to Buy
You can purchase replacement light bulbs for your 2004 Subaru WRX at various locations:
- Auto Parts Stores: Local auto parts stores like AutoZone, Advance Auto Parts, and O'Reilly Auto Parts typically stock a wide variety of bulbs.
- Online Retailers: Online retailers like Amazon and eBay offer a vast selection of bulbs at competitive prices.
- Dealerships: Your local Subaru dealership will also carry replacement bulbs, but they may be more expensive than other options.
When buying online, be sure to check the seller's reputation and read reviews before making a purchase.
DIY vs. Professional Installation
Replacing most light bulbs on the 2004 WRX is a relatively straightforward process that can be done at home with basic tools. However, some bulbs, such as those in the headlights or fog lights, may be more difficult to access and require removing parts of the car.
If you're uncomfortable performing the replacement yourself, it's always best to consult a qualified mechanic.
Frequently Asked Questions
What happens if I use the wrong bulb size? Using the wrong bulb size can result in poor illumination, improper fitment, and potential damage to the bulb socket or electrical system.
Can I use LED bulbs in my 2004 WRX? Yes, you can use LED bulbs, but you may need to install load resistors to prevent hyper-flashing for turn signals.
How do I know if my headlight bulb is burnt out? A burnt-out headlight bulb will not illuminate. Check both low and high beam functions to confirm.
Where can I find the bulb size information in my owner's manual? The bulb size information is typically listed in the specifications section or the maintenance section of your owner's manual.
Are all 9007 bulbs the same? While all 9007 bulbs have the same base and fitment, they can vary in brightness, color temperature, and lifespan depending on the manufacturer and quality.
Final Thoughts
Replacing burnt-out light bulbs is a simple yet essential maintenance task that ensures your 2004 Subaru WRX remains safe and visible on the road. Keep this guide handy and don't hesitate to consult a professional if you're unsure about any aspect of the replacement process. By keeping your lights in top condition, you'll enjoy safer and more confident driving experiences.