C→C

Code to Cause

Scan the car. Find the cause. Run the job.

Three tools in one subscription — a browser OBD-II scanner, root-cause diagnosis for any code, and a full workshop system that carries the job from check-in to invoice. Any car, any brand.

Start with a 7-day free trial — no credit card required.

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Scan the car

Plug in an adapter and read stored codes and live sensor data, right in your browser.

RPM 840 · 89°C · misfire ×0
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Find the cause

Any code decoded to the parts most likely at fault, with the exact tests to confirm it.

P0420 → O₂ sensor · catalyst
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Run the job

Raise the job card, pull the parts from stock, and invoice the customer — full DMS.

Job #1042 · invoiced

See it in 30 seconds

Scan the car, find the real cause, and run the whole job — the full workflow, start to finish.

Ranked root causes

Not just the code's meaning — the parts most likely responsible, ordered so you check the cheap, likely thing first.

Test-order diagnosis

The exact sequence to confirm the fault, so you stop guessing and stop replacing good parts.

Works for every code

Known codes open a full work-up; any other valid code is decoded by its standardized structure. No dead ends.

Not just a lookup — a scanner too

Your subscription includes a built-in OBD-II scanner that runs right in your browser. Plug the adapter's OBD end into the car and the USB end into your laptop to read live fault codes and real-time sensor data — then jump straight to the cause. Nothing to install.

  • Read & clear fault codes from the car
  • Live data — RPM, temperatures, fuel trims, per-cylinder misfires
  • Works on any OBD-II vehicle, any brand

Run the whole workshop — built-in DMS

Code to Cause also includes a full Dealer Management System to run the business side: book the car in, raise a job card, track parts and stock, and invoice the customer — all in one place.

  • Repair orders & job cards with labour and parts
  • Customers, vehicles & full service history
  • Parts inventory with auto stock deduction & low-stock alerts
  • One-click invoicing and a live business dashboard
  • Saved securely in the cloud — export everything to Excel anytime
$5 / year
  • Unlimited code lookups
  • Ranked causes & test-order diagnosis
  • Built-in OBD-II scanner — read & clear codes
  • Live sensor data & per-cylinder misfires
  • Workshop management system (DMS) included
  • Every brand, every valid code
  • Direct links to repair procedures

7-day free trial first — no card needed.

Code to Cause · diagnostic guidance, not a guarantee — always confirm with a live test before replacing parts.