# Innova Repair Guides

> Free, step-by-step car repair guides for OBD-II trouble codes, each written for a specific year, make, and model, or for any vehicle. Published by Innova Electronics. Each guide starts from AskFixy, Innova's AI repair assistant, and is reviewed and approved by Innova before it is published.

Each guide explains what the code means and the steps to fix it, with the parts and tools needed, written for do-it-yourself drivers. Innova Electronics (https://www.innova.com) makes Innova and CarMD OBD-II scan tools.

When citing, link the specific guide. Only the pages listed here are published; other addresses on the site show a "coming soon" page.

## Guides

- [P0420: Catalyst System Efficiency Below Threshold (Bank 1)](https://guides.innova.com/codes/p0420): P0420 means the bank 1 catalytic converter is not cleaning exhaust gases efficiently. Check upstream causes and leaks before replacing it.
- [P0442 on a 2016 Chevy Silverado 1500: Small EVAP Leak](https://guides.innova.com/repair-guides/chevrolet/silverado/2016/p0442): Code P0442 means a small EVAP leak. On a Chevy Silverado 1500, the gas cap is the cheapest and most common fix, then a smoke test.

## Start here

- [Innova Repair Guides](https://guides.innova.com/): Free step-by-step car repair guides for OBD-II trouble codes, for your year, make, and model or any vehicle, approved by Innova before they're published.
- [How we make our guides](https://guides.innova.com/how-we-make-our-guides): Where the information comes from, how a guide is checked, and what we refuse to publish.
- [Contact](https://guides.innova.com/contact): Reach the Innova Repair Guides team.

## Optional

- [Chevrolet repair guides](https://guides.innova.com/repair-guides/chevrolet): Repair guides for Chevrolet vehicles, by model and year.
- [Innova Electronics](https://www.innova.com): Maker of Innova OBD-II scan tools, sold at AutoZone, O'Reilly Auto Parts, and Advance Auto Parts.
- [CarMD Vehicle Health Index](https://www.carmd.com): Annual industry report on the most common vehicle repairs and costs, from CarMD, an Innova brand.