AUTOPHIX 4 Systems Car Diagnostic Tool: DM5900 4‑System OBD2 Scanner, 12V Battery Tester and Bluetooth Engine Reader
Product description
What it is
The AUTOPHIX 4 Systems tool combines four core capabilities into one compact device: 4-system diagnostics (Engine, ABS, SRS and Transmission), a 12V battery and charging tester, and full OBD2 Bluetooth connectivity. It’s designed to help drivers diagnose common car problems at home, before a trip to the workshop or dealership.
What it does

On the screen you can read and clear fault codes, view live data such as RPM, speed and transmission temperature, and monitor battery health and charging status with the included clamps. The device supports the full OBD2 engine code reader functionality directly, or you can pair it with a suitable app via Bluetooth to view data on your phone. This dual approach makes it practical whether you’re at the driveway or away from the car.
How it might help you
If you’ve ever faced a stubborn warning light, rough idle, or a car that won’t start reliably, this tool aims to provide clarity without immediately heading to a garage. It’s particularly useful when buying a used car, or if you want to verify a family car’s condition before a long journey.



What stands out
On paper, the 4-system coverage is a strong point: Engine, ABS, SRS and Transmission scanning in a single unit. The 12V battery test feature adds practical value—you can check health and cranking performance without removing the battery from the car. Another plus is the plug‑and‑play design and no required batteries, plus lifetime free updates to stay current with newer fault codes.
Limitations to consider

It may not replace professional diagnostic work for complex or highly specialised fault codes. While the device supports a broad range of vehicles, compatibility with newer or niche models can still require confirmation. If you prioritise real‑time professional-grade data or advanced service functions, this tool might feel limited.
Who it’s for
It’s a sensible choice for everyday drivers, people who want to check a used car before purchase, and households that rely on a single scanner for routine maintenance. It sits in the mid‑range of capability: more than a basic reader, but not a high-end workshop instrument.



Who it isn’t for
If you need exhaustive teardown data, manufacturer‑specific codes, or deep diagnostics for performance tuning, this device won’t replace dedicated diagnostic tools. It also may not suit you if you require offline, standalone data without Bluetooth or if you frequently work on very new or unusual models.
When it makes sense to buy

If you want a pragmatic, multi‑function scanner that covers the common maintenance tasks—reading/clearing codes, viewing live sensor data, and checking battery health—this is worth considering. The lifetime free updates reduce ongoing costs and help keep it usable as car systems evolve.
Before you buy: what to check
- Vehicle compatibility for full OBD2 functions and ABS/SRS/Transmission coverage
- Whether you’ll primarily use the device with its own display or via a connected app
- Your need for a battery health test and the included 12V testing utility



Practical use example
Imagine planning a family road trip and a dashboard light suddenly appears. You can plug in the AUTOPHIX, read engine and transmission data, confirm whether it’s a minor fault or something that warrants a visit to the garage, and in the meantime keep driving with more confidence.
FAQ (based on available data)
- Does it require batteries to operate? No, it plugs into the OBD2 port and relies on the vehicle’s power.
- Can you read live data on a phone? Yes, via Bluetooth in addition to on-device display.
- Are updates available for free? Yes, lifetime free software updates are stated.
Is it worth it?
It’s worth considering if you want one practical, all‑in‑one diagnostic tool for routine checks and common fault codes, with ongoing updates and a battery tester included. If your needs lean towards highly specialised or manufacturer‑specific diagnostics, you may want to explore more advanced options. Overall, for everyday maintenance and pre‑trip checks, it offers sensible value and straightforward use.
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