# MR2-Check — Decipher check-engine flashes

> Decipher check-engine flashes (iPhone/iPad app by Michael Yam.)

- Source: https://appshunter.io/ios/app/mr2/id6748548711 (this page in markdown: same URL + `.md`)
- Developer: [Michael Yam](https://appshunter.io/developer/1451896940)
- Category: Utilities
- Price: $1.99
- Age rating: 4+
- Requires: iOS 15.2 · 1 MB
- Languages: American English
- Released: 2025-07-14
- Data updated: 2026-02-23
- User reviews in markdown: https://appshunter.io/ios/app/mr2/id6748548711/reviews.md

## What is MR2?

MR2 owners know diagnosing their vehicle requires setting a jumper pin and interpreting flashes on the instrument panel's check-engine light. This app, MR2 Check, makes looking up the code no further than your iPhone.

Select your engine, enter the code or codes (space separated), and press "LOOK UP." Enter the code 100 to see descriptions of all codes for the selected engine.

You can also enter the code by pressing the "BLINK" button while matching the blink pattern on the check-engine light. This takes a little practice to get the timing right, and it helps to record two cycles for better accuracy.

Learn more at https://www.ytechnology.com/2023/12/mr2-check-engine.html


## Version history (last 1 release)

### 1.0 — 2025-07-14

No release notes.

## More apps by Michael Yam

- [LuldCalc](https://appshunter.io/ios/app/luldcalc/id1451896941)

All apps by Michael Yam: https://appshunter.io/developer/1451896940

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-02-23.*