Premium kit

Researched from the OBD-II standards and published manufacturer specifications

Quick answer

A paid downloadable kit is in preparation. Nothing on this site is behind it: every code page, every decision tool and every complete kit list is free to read and will stay that way.

Fill-in worksheets covering a check engine light from the first solid-vs-flashing decision to the last dollar spent fixing it: a vehicle-at-a-glance card, a check engine light action sheet with freeze frame and the drive-safety call, a reusable code and symptom log, a repair quote comparison sheet with book hours and OEM vs aftermarket, a maintenance schedule copied from your own owner's manual, a repair and maintenance cost log, a DIY-or-shop decision sheet with tools, safety and time, an emissions and inspection prep checklist, a road trip and emergency kit checklist, and a budget planner by kit tier. Two filled-in examples, a companion spreadsheet with a cost-per-mile calculator, a bonus OBD2 code families quick-reference card, and an online buyer guide with the site's own current picks by kit tier.

Get it for $22

The one purchase that actually changes outcomes

TOPDON TopScan Lite OBD2 Scanner, Bidirectional Scan Tool, 8 Resets & AI

No reference document substitutes for being able to read live data off the car. If you are deciding where to spend, spend it here rather than on paper.

Under $100Check priceBudget band; Amazon shows the current price

Coverage varies by tool and by model year, so check a specific tool against a specific vehicle before buying.

Tell me when the kit is ready

One page with every item in this kit and its budget band, so you can cost the whole thing before buying any of it.

After the list, a few short emails, then a couple a month at most. Unsubscribe anytime. You can also just read it on the site.

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Common questions

Is anything on this site paywalled?

No, and nothing is planned to be. Every trouble code page, every decision tool and all three complete kit lists are free to read in full. A paid download, if and when it exists, will be a convenience for people who want the reference offline rather than a gate on anything already published.

What would a paid kit contain?

A printable reference: the code severity and drive-safety table, the fuel trim patterns and what each indicates, readiness monitor behaviour, and the kit shopping lists with their capability reasoning. All of it derived from what is already on the site, arranged for use in a driveway rather than on a screen.

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