Autel Auto Link AL419 AL439 AL539b OBD2 OBDII Code Reader Scanner

The Autel AutoLink series consists of handheld OBDII code readers and electrical testing tools. While all share core diagnostic features like reading and clearing engine codes, they differ primarily in their electrical testing capabilities.
Core Shared Features
All three models (AL419, AL439, and AL539b) include:
Broad Compatibility: Works on most 1996 and newer OBDII & CAN vehicles.
One-Click I/M Readiness: A patented key for quick emissions checks.
DTC Support: Retrieves generic (P0, P2, P3, U0), manufacturer-specific (P1, P3, U1), and pending codes.
Data Analysis: Views freeze frame data and reads live PCM datastreams.
Hardware: Features a TFT color display (320 x 240 dpi) and a built-in speaker for audible readiness tones.

Model Comparison
[AutoLink AL539b](https://www.autel.com/mk1/3245.jhtml)
AutoLink AL419 AutoLink AL439
Primary Use
Core Engine Diagnostics
Primary Use
Diagnostics + Voltage/Resistance
AVOmeter
No
AVOmeter
Yes (Voltage & Resistance)
Circuit Test
No
Circuit Test
Yes
Battery Test
No
Battery Test
No (Condition only)
Starting/Charging Test
No
Starting/Charging Test
Yes
Current Test
No
Current Test
No
Key Differences
Autel AutoLink AL419
The entry-level option focuses strictly on OBDII diagnostics. It is ideal for users who only need to identify engine fault codes and check emissions readiness.