Latest guides
Practical notes from the Guides section.
- Why Are My LED Headlights Flickering? Causes and FixesLearn why LED headlights flicker and how to check wiring, voltage, PWM, CAN bus compatibility, grounds, and LED driver problems.
- Do I Need a Load Resistor for LED Bulbs?Learn when LED bulbs need a load resistor, how to check for errors or hyperflash, and safer alternatives for your vehicle.
- What Is an LED Decoder?Learn what an LED decoder does, why LED headlights trigger warnings, and how to troubleshoot flicker, error messages, and shutdowns safely.
- CANbus vs. Non-CANbus LED Bulbs: How to ChooseLearn how CANbus and non-CANbus LED bulbs differ, how to check compatibility, and how to avoid flicker, warning lights, and wiring issues.
- What Is a CANbus LED Bulb?Learn how CANbus LED bulbs work, when you need one, and how to avoid dashboard bulb-out warnings, flicker, and compatibility issues.
What this site is for
Look up bulb positions, cross-references, and year-by-year fitment without guessing from a parts-counter printout.
Vehicle fitment
Make → model → year → positions and bulb codes from the Autotk catalog.
Bulb types
H11, 9005, 9012 and the rest — fitment counts, positions, and cross-reference notes from the catalog.
Guides
Practical swap notes: halogen vs LED, legality caveats, and common mistakes.