# Automobile Engineering Book vs OBD2 Fault Codes with Solution

The clearest difference is review sentiment: Automobile Engineering Book at 100% against OBD2 Fault Codes with Solution's 50%. Automobile Engineering Book also leads on rating (4.6 vs 3.7) and ads (none vs shown). OBD2 Fault Codes with Solution's advantage is iOS requirement (12.0 vs 14.0). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Automobile Engineering Book sells 4 in-app purchases, starting at $2.99 per 3 months and OBD2 Fault Codes with Solution sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Automobile Engineering Book holds the better App Store score, 4.6 against 3.7. Both are backed by a comparable volume of ratings — 9 and 3 respectively. Written reviews point the same way: 100% of Automobile Engineering Book's written reviews are positive against 50% of OBD2 Fault Codes with Solution's.

Automobile Engineering Book ships an update every 5 weeks, OBD2 Fault Codes with Solution every 9 months. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Automobile Engineering Book | OBD2 Fault Codes with Solution |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (9 ratings)](https://appshunter.io/ios/app/automobile-engineering-book/id1583758958/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/obd2-fault-codes-with-solution/id6464370892/reviews) |
| Number of ratings | **9** | 3 |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 weeks** | Every 9 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 136 MB | 75 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Oleksandr Pereshein](https://appshunter.io/developer/1041461209) | [Muhammad Asad Khan](https://appshunter.io/developer/1227004769) |

## What reviewers say

### Automobile Engineering Book

[App page](https://appshunter.io/ios/app/automobile-engineering-book/id1583758958)

This app provides a comprehensive yet accessible guide to automobile engineering. It covers basic vehicle structure, common malfunctions, and maintenance rules in a clear, engaging format with ample illustrations. Ideal for novice drivers and anyone seeking to understand their car better.

**Highlights:** Basic vehicle structure information, Common malfunctions and solutions, Operation and maintenance rules, Simple language explanations of car systems, Extensive illustrative material

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version | $2.99 | per 3 months |
| Full version for three months | $2.99 | one-time |
| Full version for one year | $4.99 | one-time |
| Full version forever | $6.99 | one-time |


### OBD2 Fault Codes with Solution

[App page](https://appshunter.io/ios/app/obd2-fault-codes-with-solution/id6464370892)

Decode automotive trouble codes with a comprehensive database and detailed explanations. Find step-by-step guides to diagnose and resolve issues, making car maintenance accessible for all users.

**Highlights:** OBD2 code database, Detailed code descriptions, Solution guides, User-friendly interface, Vehicle make and model coverage

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get Premium Version | $1.99 | one-time |


## Frequently asked questions

### Is Automobile Engineering Book free?

Automobile Engineering Book is free to download, with in-app purchases available.

### Is OBD2 Fault Codes with Solution free?

OBD2 Fault Codes with Solution is free to download, with in-app purchases available.

### Which has better reviews, Automobile Engineering Book or OBD2 Fault Codes with Solution?

Automobile Engineering Book is rated higher. Automobile Engineering Book averages 4.6 out of 5 from 9 ratings, while OBD2 Fault Codes with Solution averages 3.7 from 3 ratings.

### Do Automobile Engineering Book or OBD2 Fault Codes with Solution have ads?

OBD2 Fault Codes with Solution shows ads; Automobile Engineering Book does not.

### Which is updated more often, Automobile Engineering Book or OBD2 Fault Codes with Solution?

Automobile Engineering Book ships an update every 5 weeks, and OBD2 Fault Codes with Solution every 9 months. Most recently, Automobile Engineering Book was updated on October 16, 2026 and OBD2 Fault Codes with Solution on October 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*