Autel AutoLink AL539B Full OBD2 Code Reader, AVOmeter & Battery Tester – 3-in-1 Automotive Diagnostic Tool

The Autel AutoLink AL539B is an ultimate 3-in-1 automotive analyzer that combines an AVOmeter, Battery Tester, and OBD2 Code Reader in a single powerful tool. Specially designed to work with most 1996 and newer American, Asian, and European OBD II/CAN compliant vehicles, the AL539B offers comprehensive vehicle analysis for rapid, accurate diagnosis and timely repair — making it the ideal solution for both professional technicians and everyday DIYers.

Simply put: Autel AutoLink AL539B = AL539 + Battery Test. This expanded OBD2 scanner builds upon the AL539 by adding advanced battery testing capability, giving you a more complete and thorough diagnostic experience in one compact device.

What is the Autel AutoLink AL539B?

The AL539B is an engine code reader and electrical testing tool rolled into one. It can read and erase engine codes, display live and freeze frame data, supports all 10 OBDII test modes, and features one-click I/M readiness and emissions testing. An OBDII cable, voltage test probes, and an AVO meter are included for testing the starting, circuit, voltage, continuity, current, and charging systems. It is updatable via PC, and a 1-year tool warranty along with free lifetime software updates are available with every purchase.

Autel AL539B Key Features at a Glance

• Read and Erase Engine DTCs (Diagnostic Trouble Codes)
• Tests Starting, Circuit, and Charging Systems
• AVO Meter Tests Voltage, Continuity, and Current
• Display Live and Freeze Frame Data
• One-Touch I/M Readiness with LED Indicator
• FREE Lifetime Software Updates (lifetime of tool) and 1-Year Warranty
• Includes Voltage Test Probes and OBDII Cable
• Supports All 10 OBDII Test Modes
• Covers Domestic, Asian, and European Vehicle Manufacturers (1996 and newer)
• Easy-to-Use Navigation and Software Updates via PC
• Full Color TFT Display – 320 x 240 dpi

Autel AL539B Technical Specifications

• Display: TFT Color Display (320 x 240 dpi)
• Operating Temperature: 0 to 60°C (32 to 140°F)
• Storage Temperature: -20 to 70°C (-4 to 158°F)
• Dimensions (L x W x H): 175 mm (6.91") x 96.6 mm (3.80") x 37 mm (1.46")
• Weight: 0.3 kg (0.8 lb, without wire) or 0.68 kg (1.82 lb, with wire)

Battery Test – Advanced 12V Battery Diagnostic Capability

The Autel AL539B is an expanded OBD2 scanner with the additional capability of battery testing, making it a complete solution for quickly and accurately testing most types of 12V batteries, including AGM, standard, and maintenance-free batteries. Whether you're checking a weak battery or diagnosing a no-start condition, the AL539B gives you fast and reliable results right at your fingertips.

Circuit Test – AVOmeter for Voltage, Continuity and Current

The Autel AL539B is not only a simple OBD2 code reader but also a top-rated battery tester with a built-in AVOmeter. It allows you to quickly access information about voltage, continuity, and current of any vehicle for a complete battery status analysis. The easy-to-read AVO meter makes electrical testing straightforward — even for beginners.

Emission-Related Diagnostic Features

Beyond its battery testing capability, the AL539B OBD2 scanner provides all essential emission-related diagnostic functions. These include:

• I/M Readiness Status Check — verifies emissions readiness before testing
• O2 Sensor Test — checks oxygen sensor performance
• On-Board Monitor Test — runs on-board diagnostic monitoring tests

These features are necessary for passing emission tests and ensuring your vehicle is running within legal and environmental standards.

MIL Turn-Off – Clear Check Engine Light with Ease

One of the most direct and widely used functions of the Autel AL539B code scanner is the ability to turn off the Check Engine Light (MIL). This is accomplished by clearing stored fault codes once the underlying issue has been resolved — saving you a trip to the mechanic for a simple code reset.

Detailed Functions of the Autel AutoLink AL539B

1. Starting and Charging Systems Test

The AL539B is capable of diagnosing 12V charging systems, starting systems, and the condition of a discharged battery — helping you identify electrical issues before they leave you stranded.

2. Circuit Test

The electrical test tool provides quick and accurate load-free testing for most types of 12V batteries, including AGM, standard, and maintenance-free batteries.

3. AVO Meter

The easy-to-read AVO meter allows you to test voltage, continuity, and current at your fingertips — making electrical fault-finding faster and more precise.

4. Retrieve Generic and Manufacturer-Specific Codes

The AL539B retrieves:

• Generic codes: P0, P2, P3, and U0
• Manufacturer-specific codes: P1, P3, and U1
• Pending codes

5. Live Data, Freeze Frame Data and O2 Sensor Test

The scanner supports reading and graphing live PCM data stream, live O2 sensor test data, and freeze frame data — giving you real-time insights into your vehicle's performance.

6. I/M Readiness and Emissions Monitor Status

Displays monitor and I/M readiness status for emissions compliance — a must-have function for preparing your vehicle for state emissions inspections.

7. Turn Off Check Engine Light, Clear Codes and Reset Monitors

Easily turn off the Check Engine Light (MIL), clear stored fault codes, and reset monitors after repairs have been completed.

8. Vehicle Information Retrieval

Retrieves full vehicle information including VIN, CIN, and CVN — making vehicle identification fast and accurate.

9. Extensive Vehicle Coverage

The OBD2 scanner AL539B is suitable for most 1996 US-based, 2000 EU-based, and newer OBD2 and CAN protocol vehicles, including popular brands such as Ford, GM, Honda, Jeep, Toyota, Dodge, Nissan, Chevrolet, and many more.

10. Internet Updateable via PC

To provide the best user experience, the AL539B supports updating via the internet for the latest bug fixes, newest vehicle models, and additional system data — ensuring your tool is always up to date.

Patented One-Click I/M Readiness Key

The AL539B features Autel's patented One-Click I/M Readiness Key with a built-in LED indicator, allowing you to instantly check your vehicle's emissions readiness status with a single button press — the fastest and easiest way to verify if your car will pass an emissions test.

Built-in Speaker and TFT Color Display

The versatile and easy-to-use AL539B is equipped with a TFT full color display (320 x 240 dpi) and a built-in speaker to streamline automotive service centers for fast, accurate diagnosis and timely repair.

Autel AL539B Package Contents

• 1 x Main Unit (Autel AutoLink AL539B)
• 1 x Battery Test Cable
• 1 x USB Cable
• 1 x OBDII Cable
• 1 x Probes
• 1 x 3.7V Li-ion Battery
• 1 x Carry Case
• 1 x CD
• 1 x User Manual

Warranty and Customer Support

Every Autel AutoLink AL539B comes with a 1-year tool warranty and free lifetime software updates for the lifetime of the tool. Technical support is available via email or Q&A if you are unsure whether this scanner tool is suitable for your vehicle or have any questions before purchasing.