Latest guides
Practical notes from the Guides section.
- 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.
- Can LED Headlight Bulbs Overheat? Causes, Warning Signs, and PreventionLearn why LED headlight bulbs overheat, how to spot thermal problems, and how to improve cooling for longer bulb life.
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.