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ATDIAG AT330: OBD2 Engine Code Reader Review

Here's where you can get an in-depth review of the ATDIAG AT330
If you’re looking for an in-depth review of the ATDIAG AT330, this is the right place

Are you spending a fortune on solving basic engine and drivability issues? If so, then you need an affordable OBD2/EOBD code reader. The ATDIAG AT330 Car code reader is designed to read and clear diagnostic trouble codes.

ATDIAG AT330 vs Autel AutoLink AL319 vs BAFX Comparison Chart

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Autel AL319
Autel AL319
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Customer Rating
4.24.2 / 5
4.54.5 / 5
4.44.4 / 5
PriceATDIAG AT330 priceAutel AL319 priceBAFX price
Product Dimensions63" x 17.7" x 92.5"2.8" x 1.5" x 1"
Item Weight6.2oz2.88oz
ProsRead and Clear fault codes;
Supports I/M readiness test;
Compatible with OBD2/EOBD domestic and foreign vehicles;
Support live data and Freeze frame.
Same as AT330Same as AT330
ConsJust a basic code reader.Does not support ABS, airbag.Not support iOS devices.
Bottom LineAT330 is for beginners.Autel Al319 is a good pick for any car owners.BAFX suits those that prefer Bluetooth.

ATDIAG AT330 Overview 

Atdiag at330 review
ATDIAG Car obd2 code reader, AT330 OBDII/EOBD Auto Scanner
4.74.7 / 5
ATDIAG AT330 is the most Advanced next Generation code reader to Diagnose all 1996 and newer OBDII compliant vehicles. This little device saves you the trips to your mechanic, lets you decide if it’s something you can fix or need more advanced help.

This code reader can help you to verify repairs, emission status, and road tests. Besides, the ATDIAG AT330 reader is built with the average car owner in mind. It has four hotkeys for ease of navigation and clearing codes. Better yet, it has a colored screen that allows you to read and clear codes easily. To find out more about The ATDIAG AT330, read this comprehensive review that heights features, strengths, and weaknesses.

Detailed Review of ATDIAG AT330

Features and Functionalities

1. Retrieve the I/M readiness status


Being able to retrieve your car’s I/M readiness status before taking it for a smog test can help you save time and money. You will be able to clear pending codes and rectify the fuel system’s faults using the code reader. The ATDIAG AT330 code reader can effectively connect with the onboard computer to retrieve your vehicle’s I/M readiness status. It has a one-click smog readiness key that allows you to perform a comprehensive I/M readiness test. Reading the I/M readiness status using this code reader is incredibly easy. This is because it has colored LEDs that indicate the emission status of a vehicle. You can retrieve codes indicating that your car is in good condition. It means that your car will easily pass the smog test when it is in good condition. On the other hand, you can retrieve codes indicating pending issues that need to be cleared. Under such circumstances, you need to clear the pending codes to pass the smog test. In the worst-case scenario, you can retrieve codes indicating that your car is in bad condition. You will need to perform comprehensive repairs on your car to be able to pass the smog test. Once the repairs are complete, the ATDIAG AT330 code reader will verify that the repairs were effectively done.


The system takes time to connect and sometimes fails to make connections in vehicles listed to be compatible.

2. Read and clear fault codes


If you have an OBD2/EOBD compliant vehicle, you need a code reader to read and clear fault codes. This will help you reduce the number of trips to your mechanic, eventually helping you save time. On the other hand, you will cut down on the cost of repairs as you can clear codes without taking your car to a mechanic. The best part is that the ATDIAG AT330 can help you read live data. Therefore, it means that you will be able to make all your repair decisions on accurate data. At the same time, the code reader can help you to retrieve freeze frame data. The combination of freeze frame and live data can help you perform better diagnosis and repairs.

Even better, you can be able to retrieve the generic code (P0, P2, P3, and U0), manufacturers code (P1, P3, and U1), and pending codes.


This code reader does not support live graphing. Besides, the small screen makes the process of reading and clearing codes cumbersome.

3. Retrieve VIN, CVN, and CIN


If you need to track the records of a vehicle, then you need its Vehicle Identification Number (VIN). But where do you find the VIN of an OBD2/EOBD compliant vehicle? Well, you can easily retrieve the VIN of any vehicle from the Vehicle onboard computer using a code reader. Fortunately, the ATDIAG AT330 can accurately retrieve VIN from any compatible OBD2/EOBD compliant vehicle. This is particularly useful when you want to buy a used car. The information can help you establish the actual condition of the car and the millage.


The ATDIAG Car obd2 code reader only works on 12 Volt vehicles. You will find that it does not work on heavy trucks.


The ATDIAG AT330 is compatible with OBD2/EOBD vehicles manufactured after 1996. The vehicles include U.S domestic manufactured vehicles and foreign models. You will notice that this code reader supports six languages: Russian, French, Spanish, English, Dutch, and Deutsch.


  • It is really easy to use.
  • The code reader is really affordable.
  • It has a one-click readiness test button for ease of diagnosis.
  • It has LEDs that allow you to establish the emission status at a glance.
  • You will be able to retrieve live data and freeze frame.
  • It is multilingual as it supports six languages.
  • It is light and portable, allowing you to carry it anywhere you go.
  • It has a colored TFT screen.


  • You will notice that it fails to establish connections in some vehicles listed to be compatible.
  • It isn’t easy to update or upgrade.
  • The code reader does not retrieve codes on vehicles that use 24V batteries.
  • You will not be able to perform any advanced function with this code reader.
  • It is really slow and takes several minutes to retrieve codes.

Who Is It For?

The ATDIAG AT330 is fundamentally designed for average car owners. If you want to perform basic diagnostic functions affordably, then you can check out this code reader. You will notice that it is really easy to use.

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The Bottom Line

With most vehicles being OBD2/EOBD compliant, you need a code reader to help you read and clear codes. The ATDIAG AT330 can help you save money and time as you will be making fewer trips to a mechanic shop. Besides, this code reader is affordable and very easy to use. It is a code reader recommended for average car owners who want to perform basic diagnostic functions.

Bonus: BAFX Bluetooth Diagnostic OBDII Scanner For Android Review

A video about ATDiag AT330 review
Tim MillerFounderOBD Advisor

I’m Tim Miller from Denver, Colorado. I’m the founder of obdadvisor.com, an automotive blog about "Auto Diagnostic Tools and Repair Guides". My fan page is facebook.com/autozikcom. I've been working as an automotive mechanic and blogger for over 10 years writing articles to share my experiences and expertise.

Web: https://www.obdadvisor.comEmail: [email protected]
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