How to Replace Both Headlight Bulbs on a 2018 Mazda 3 (Low & High Beam Guide)
Step-by-step instructions, bulb type identification (halogen vs LED/HID), tools, parts, and safety tips
How to Replace Both Headlight Bulbs on a 2018 Mazda 3 (Low & High Beam Guide)
Step-by-step instructions, bulb type identification (halogen vs LED/HID), tools, parts, and safety tips
🔧 Mazda3 - Headlight Bulb Replacement
On your Mazda3, the “headlight bulbs” can mean the low beams, the high beams, or both. The exact bulb type and access steps change depending on whether your headlights are halogen (replaceable bulbs) or a LED/HID-style unit (may be a different procedure).
Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours
⚠️ Safety & Precautions
- ⚠️ Turn lights off and let the headlight area cool before touching anything.
- ⚠️ Do not touch halogen bulb glass with bare fingers (skin oil shortens bulb life).
- ⚠️ If equipped with HID/LED components, avoid powering on with parts unplugged.
- ⚠️ Keep keys away; prevent auto-headlights from turning on.
🔧 Required Tools
You'll need the following tools for this repair:
- Nitrile gloves
- Safety glasses
- Small flathead screwdriver
- Phillips #2 screwdriver
- Trim clip removal tool
- Flashlight
🔩 Required Parts
HowToo sells all the parts you need for this repair:
- Headlight bulbs - Qty: 2
đź“‹ Before You Begin
- Park on level ground, shift to Park, and set the parking brake.
- Turn the headlight switch to OFF and remove the key/fob from the car.
- Open the hood and support it securely.
🔨 Step-by-Step Instructions
Follow these steps in order:
Before I finalize Steps 1+
- Quick check needed so I give you the exact bulb type and exact steps.
Question 1: Are you replacing the low beams (main headlights) only, or high beams too?
Question 2: Do your headlights use a standard halogen bulb (usually a twist-out bulb behind a round dust cap), or are they a LED/HID-style headlight (often looks like a “sealed” unit with no obvious bulb access)? If you’re not sure, upload a photo of the back of the headlight from under the hood.
âś… After Repair
- Turn headlights on and confirm both sides match in brightness and color.
- Verify high beams work (if replaced) and that the headlight aim looks even.
- If one side still doesn’t work, re-check the connector is fully seated.
đź’° DIY vs Shop Cost
Shop Cost: $120-$300 (parts + labor)
DIY Cost: $30-$140 (parts only)
You Save: $90-$160 by doing it yourself!
Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.
🎯 Ready to get started?
HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.
