FOXWELL NT301 Plus OBD2 Code Reader and 12V Battery Tester

OBD2 Reader Tester: The FOXWELL NT301 Plus combines engine-code reading with tests for 12V battery health, cranking, and charging systems. It also displays live engine data, making it a practical handheld option for routine checks, but it is limited to engine diagnostics rather than ABS, SRS, or transmission systems.

At a glance

Reads and clears engine trouble codes and displays code definitions.
Shows live data including RPM, sensor readings, and fuel trim. The listing also describes recording and replaying data and printing reports from a Windows PC.
Tests 12V lead-acid battery health, cranking performance, and charging output.
Includes I/M readiness checking and EVAP leak testing, subject to vehicle compatibility.
No app or subscription is listed as required.

Price

$79.98Save 20%

Reference price: ~~$99.99~~

Price checked: Nov 14, 2026

View offer

Pros and cons

Pros

Combines engine-code diagnostics and 12V battery, cranking, and charging checks in one handheld unit.
Live engine data and displayed code definitions can help owners investigate a check-engine light before seeking service.
The listed battery types include flooded, AGM, EFB, and GEL lead-acid batteries.

Cons

It does not provide ABS, SRS, transmission, key programming, oil reset, or battery registration functions.
The battery function is limited to 12V batteries and does not include a load test.
Updates are limited to Windows according to the listing, with Mac and iOS unsupported.

Technical specifications

11 specifications

Identity
Brand	FOXWELL
Model	NT301 Plus

Display
Screen size	2.8 inches

Power and battery
Power configuration	Corded Electric

Dimensions and weight
Dimensions listed	3.7"L x 1.6"W x 5.71"H
Weight listed	600 g

Diagnostics and compatibility
Vehicle compatibility listed	1996+ U.S. vehicles, 2001+ European models, and 2005+ Asian cars via the standard 16-pin OBDII port
Battery compatibility listed	12V lead-acid Flooded, AGM (flat or spiral), EFB, and GEL batteries
Diagnostic exclusions listed	Does NOT support ABS, SRS, transmission, key programming, oil reset, or battery registration. NOT compatible with tire sensors or airbag codes.
Battery test limitations listed	Works with 12 V batteries only, no load test, and no built-in battery.
Update compatibility listed	Only support update with Windows system, not support MAC/IOS

What to know before buying

The vehicle coverage is stated as 1996+ U.S., 2001+ European, and 2005+ Asian models with a standard 16-pin OBDII port. Pre-1996 vehicles and several named makes or models are excluded, and special protocols may require an extra connector. Confirm compatibility for the specific vehicle. Battery tests require a firm connection between the battery clamp cable and OBDII cable. The listing says to fix vehicle issues before clearing codes.

What’s in the box

Included

1 x Battery Clamp Cable
1 x Carry Bag
1 x FOXWELL NT301 Plus OBD2 Scanner Car Battery Tester
1 x USB Mini Cable
User manual

Who is it for?

A good fit for

Drivers who want engine-code reading and basic live data alongside 12V battery checks.
Home mechanics checking battery condition or investigating a check-engine light.
Used-car shoppers who want a handheld tool for engine codes and battery checks, after confirming vehicle compatibility.

Less suited to

Anyone needing ABS, SRS, transmission, or other system diagnostics beyond engine codes.
Owners seeking 24V battery testing, battery load testing, or battery registration.
Mac or iOS users who need to update the tool.

FOXWELL NT301 Plus OBD2 Code Reader and 12V Battery Tester · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 2,804 ratings

5 stars74%74%
4 stars15%15%
3 stars5%5%
2 stars2%2%
1 star4%4%

Customer feedback describes the tool as easy to use and useful for home mechanics, with positive comments about its battery testing and diagnostic accuracy. Reports are mixed on code accuracy and vehicle compatibility, and some customers describe the instructions as difficult to follow. Those points matter if you need reliable code interpretation for a specific vehicle or depend on non-Windows updates. The aggregate ratings lean positive, but do not establish performance for every vehicle or use case.

Positive themes

Customers describe it as simple to use and useful for home mechanics.
Battery testing and diagnostic accuracy receive positive feedback.

Mixed feedback

Feedback is mixed on code accuracy and vehicle compatibility, including reported difficulty clearing airbag codes.
Instructions receive mixed reactions, with some customers finding the manual difficult to understand.
Some customers report Mac compatibility issues, while the listing itself limits updates to Windows.

Frequently asked questions

What does the FOXWELL NT301 Plus test?

It reads and clears engine codes, displays live engine data, and tests 12V battery health, cranking performance, and charging output. The listing also describes I/M readiness and EVAP checks.

Does it diagnose ABS, airbag, or transmission systems?

No. The listing excludes ABS, SRS, transmission, and airbag-code functions, along with key programming, oil reset, and battery registration.

Will it work with my vehicle?

The stated coverage is U.S. vehicles from 1996+, European models from 2001+, and Asian cars from 2005+ using a standard 16-pin OBDII port. Some makes, models, or special protocols may not be supported, so confirm compatibility before buying.

Can I update it with a Mac or iPhone?

The listing says updates require Windows and are not supported on Mac or iOS.