# Check Engine Chat — Offline Car Diagnostics AI

> Offline Car Diagnostics AI (iPhone/iPad app by Yao Vah Saechao.)

- Source: https://appshunter.io/ios/app/check-engine-chat/id6755978445 (this page in markdown: same URL + `.md`)
- Developer: [Yao Vah Saechao](https://appshunter.io/developer/1845021267)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.2 · 2.7 GB
- Languages: English
- Released: 2026-04-08
- Data updated: 2026-07-31
- User reviews in markdown: https://appshunter.io/ios/app/check-engine-chat/id6755978445/reviews.md

## What is Check Engine Chat?

Your AI mechanic, running entirely on your phone.

Ask any car question and get instant, accurate answers grounded in a curated automotive database covering 400+ vehicle models from 1976 to 2025. Oil specs, torque values, tire pressure, transmission fluid, spark plug gaps, DIY repair guides with tool lists and difficulty ratings, and symptom-based diagnostic troubleshooting.

AUDIO DIAGNOSTICS (Pro)
Record your engine sound. The AI analyzes the audio and identifies the problem such as knock, turbo failure, belt squeal, timing chain wear, transmission whine, VTEC rattle, and more. All processed on-device in seconds.

PRIVACY FIRST
Everything runs on your iPhone. No cloud servers. No accounts. No analytics. No tracking. Works in airplane mode. Your car problems are yours.

FEATURES
- Vehicle spec lookup (oil, torque, tire pressure, fluids)
- DIY repair guides with tool lists and difficulty ratings
- Symptom based diagnostic reasoning
- Audio engine sound diagnosis
- Aftermarket and mod guidance
- Conversation history + Generate Report
- Works fully offline after setup

Requires iPhone with at least 6gb ram.
Built by car enthusiasts.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Audio Diagnostics Pro | $4.99 | one-time |



## Version history (last 5 releases)

### 3.14.0 — 2026-07-26

Audio Diagnostic sound library up from 13 categories to 23.
Improved Audio Diagnostics accuracy.
Improved on-device model performance.
Ask general car questions.

### 3.13.1 — 2026-06-09

Improved model reasoning performance.

### 3.13.0 — 2026-05-13

The AI model now ships inside the app. No more download setup on first launch open the app and start asking questions immediately.

Pick your trim when setting up a vehicle (STI, Si, SS, Type R, etc.) and the AI uses it to surface engine-specific specs and procedures instead of generic model-level answers. A WRX STI now gets EJ257 answers, not blended WRX content.

IMPROVED:
  - Smarter underlying AI model with better diagnostic reasoning
  - Cleaner vehicle database
  - Vehicle picker now shows your saved cars first for one-tap re-select

### 2.1.2 — 2026-04-14

Audio inference improvement.
Text inference improvement.
Audio upload/record attachment input.
Download progress and download performance bugs.
Bugs and fixes.

### 2.1.1 — 2026-04-09

Significant model improvements.
Text and Audio inference improvements.

## More apps by Yao Vah Saechao

- [Video-QR Studio](https://appshunter.io/ios/app/video-qr-studio/id6761097249)

All apps by Yao Vah Saechao: https://appshunter.io/developer/1845021267

---

*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 2026-07-31.*