Most complete
$49–99
Vehicle-specific bundles
A deeper diagnostic library organized around a vehicle or platform, with symptom maps, inspection sequences, tool lists, and escalation guidance.
Explore bundlesFix it before you call
Diagnose first. Pay for repairs second.
Straightforward diagnostic guides for motorcycles, vehicles, tools, and everyday equipment—so you can check the likely causes before approving an expensive repair.
Instant digital access · Practical checklists · Clear stop points
The CheckFirst standard
Built to help you make a better next move.
No miracle-fix promises
We explain likely causes and checks without pretending every repair is simple or risk-free.
Safety before savings
Clear boundaries tell you when to put down the tools and call an experienced professional.
A disciplined diagnostic process
Stop guessing. Check in the right order.
CheckFirst turns a worrying symptom into a measured sequence: what to inspect, what the result means, and what to do next.
- 01
Start with the symptom
Match the noise, warning light, error code, or no-start condition to a focused diagnostic path instead of guessing at parts.
- 02
Run the cheapest checks first
Follow a practical sequence with the tools, difficulty, and likely causes clearly labeled before you spend money.
- 03
Know when to stop
Every guide separates reasonable DIY checks from work that belongs with a qualified technician.
The toolkit
Pick the depth your problem needs.
Diagnostic cheat sheets
$9.99
Fast, printable checklists for one specific symptom or common repair concern.
DIY troubleshooting guides
$29
Step-by-step diagnosis with likely causes, tools, difficulty, and clear next actions.
CheckFirst membership
$10/mo
Growing access to checklists, guides, and newly released diagnostic content.
Digital products are delivered after purchase. Availability varies as the library grows.
Before you approve the quote
Give the problem one careful check first.
Find the guide that matches your symptom and walk into the repair decision with better questions—and fewer assumptions.