VDIAGTOOL VD31 OBD2 Scanner with Battery Testers

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Product guide

VDIAGTOOL VD31 OBD2 Scanner with Battery Testers

Testers: The VDIAGTOOL VD31 is a plug-in OBD2 code reader that also offers vehicle-battery and key-fob battery testing. Its engine diagnostics cover common OBD2 functions, but it is not presented as a scanner for ABS, SRS, TPMS, or other non-engine systems.

At a glance

Reads and clears engine fault codes and provides live-data graphing, freeze-frame review, and one-click I/M readiness checks.
The listing describes a separate car-battery voltage test and a key-fob battery test powered by the included 9V battery.
Data can be reviewed and printed, and software updates are claimed to be free for the product's lifetime via a Windows PC.

Price

$53.99Save 23%

Reference price: ~~$69.99~~

Price checked: Nov 14, 2026

View offer

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Pros and cons

Pros

Combines OBD2 engine-code reading with car-battery and key-fob battery checks.
One-click I/M readiness and 4-in-1 live-data graphing can help with emissions preparation and basic troubleshooting.
No smartphone or Wi-Fi is needed for the plug-in code-reader function.

Cons

Diagnostics are limited to OBD2 functions and do not cover systems such as ABS, SRS, TPMS, or airbags.
Key-fob testing uses a separate 9V battery, which the listing says to remove between tests to preserve its charge.

Technical specifications

4 specifications

Identity
Brand	VDIAGTOOL
Model	VD31

Display and video
Screen size	2.8 inches

Power and battery
Power configuration	Code Reader Powered by connecting to OBD2 Port; Car Key Battery Tester Powered by 9v Battery( (Included)

What to know before buying

Compatibility is described for OBD2-compliant vehicles, including US vehicles from 1996 and EU-based and Asian vehicles from 2000. It will not scan vehicles that do not follow the OBD2 protocol.

Listing details to confirm

The listing's feature descriptions vary in DTC lookup library size, citing 198869+, 100,000+, and 10000+ DTC. It also gives conflicting wording around key-battery testing and describes 10 OBD2 tests without fully consistent mode details. Treat these as unconfirmed listing claims and check the selected listing for the exact functions and lookup coverage.

What’s in the box

Included

Data cable, quantity 1
User manual ×1
Packing box, quantity 1
VD31 scanner code reader, quantity 1

Who is it for?

A good fit for

Drivers who want a standalone tool for reading and clearing engine codes and checking I/M readiness.
DIY users and used-car shoppers who can benefit from live data and freeze-frame review.
Buyers who want vehicle-battery and key-fob battery checks alongside basic OBD2 diagnostics.

Less suited to

Anyone needing ABS, SRS, TPMS, airbag, or broader all-system diagnostics.
Owners of vehicles that do not support the OBD2 protocol.
Buyers seeking a wireless or smartphone-based scanner.

VDIAGTOOL VD31 OBD2 Scanner with Battery Testers · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 389 ratings

5 stars76%76%
4 stars15%15%
3 stars6%6%
2 stars1%1%
1 star2%2%

Customer feedback describes the scanner as easy to use and useful for routine checks, with positive comments about battery testing and used-car inspections. Reports on code accuracy and vehicle compatibility are mixed, including concerns about code validation and connection issues. That matters because the tool's stated purpose is basic OBD2 engine diagnostics, and vehicle support depends on OBD2 compatibility.

Positive themes

Customers describe it as easy to use and appreciate its battery-testing functions.
Some customers say it helps with used-car checks and can reduce the need for shop visits.

Mixed feedback

Feedback on code accuracy and compatibility is mixed, with reports of both successful use and code-validation or connection problems.

Frequently asked questions

What diagnostic systems does the VD31 cover?

The listing describes OBD2 engine-code functions, including reading and clearing codes, live data, freeze-frame review, and I/M readiness. It says the tool does not diagnose ABS, SRS, TPMS, or airbag systems.

Does the scanner need its own battery?

The code reader is powered through the vehicle's OBD2 port. The key-fob battery tester uses an included 9V battery.

Which vehicles are listed as compatible?

The listing claims support for OBD2-compliant US vehicles from 1996 and EU-based and Asian vehicles from 2000. Vehicles that do not follow the OBD2 protocol are not supported.

Can it test a key-fob battery?

Yes. The listing describes a key-fob battery test using a frequency entered or selected in the menu. It advises removing the 9V battery when the tester is not in use.