FOXWELL NT301 Plus 2-in-1 OBD2 Scanner & 12V Battery Tester — NT301 Plus, 2.8-inch Color Display, Live Data

FOXWELL NT301 Plus is a handheld 2-in-1 automotive tool that reads OBD2 engine codes and tests 12V battery health so you can diagnose check-engine lights and battery issues before a repair shop visit.

Compact and easy to use, the NT301 Plus merges an OBD2 code reader with a professional-grade 12V battery tester in a single device. Its 2.8" color display is 36% larger than the previous NT301 model, making onscreen results easier to read. The unit is designed for DIYers, used-car inspectors, home mechanics and drivers who want clear, actionable diagnostic information without subscriptions or apps.

How does the NT301 Plus identify check-engine problems?

Plug the NT301 Plus into your vehicle’s OBDII port and it quickly retrieves stored, pending, and permanent diagnostic trouble codes (DTCs). The built-in DTC lookup explains codes in plain language, helping you decide whether a simple fix is possible or if a professional is needed.

• Reads and clears engine DTCs for quick troubleshooting.
• Shows live data like RPM, coolant temperature, and fuel trim to pinpoint issues.
• Includes I/M readiness test to confirm emissions status for inspections.
• Records and plays back data for intermittent problem detection and report printing.

What battery checks can I run with this tool?

The NT301 Plus performs a comprehensive 12V battery health analysis, testing starting power, state of charge, and charging system function. It supports common 12V lead-acid battery types—flooded, AGM (flat/spiral), EFB and GEL—so you can determine whether to recharge, maintain, or replace the battery.

• Quickly assesses battery health to reduce no-start surprises.
• Detects weak starting power and alternator/charging problems.
• Works after jump-starts or storage periods to verify battery condition.
• Requires firm connection of battery cable to OBDII diagnostic lead for accurate results.

Can this device help me pass emissions inspections or find fuel leaks?

Yes—the NT301 Plus runs an I/M readiness check to show whether emissions monitors are complete and inspection-ready. It also offers an EVAP system test to help detect fuel vapor leaks, from a loose gas cap to cracked hoses, improving your chances of passing a smog test.

• I/M readiness test with instant pass/fail indicators via LEDs and optional beeper.
• EVAP leak check helps diagnose fuel system vapor leaks.
• Drive-cycle verification and straightforward status reporting for inspections.

What vehicles and features are supported or not supported?

This scanner supports most 1996+ U.S. cars, 2001+ European models and 2005+ Asian vehicles using the standard 16-pin OBDII port. It requires no subscription or mobile app, but it is limited to engine (powertrain) codes and 12V battery diagnostics—ABS, SRS, transmission special functions, key programming, and battery registration are not included.

• Compatible with many cars, pickups, motorcycles and ATVs using OBD2 protocol.
• Not suitable for pre-1996 vehicles and several specific marques (some Fiat/Alfa/Lancia, certain Peugeot/Citroën, Ssangyong, Lada, VAZ, UAZ, GAZ).
• Windows-only firmware updates; no Mac/iOS updater available.
• Does not perform load tests or work with non-12V battery systems.

Who is this for: The FOXWELL NT301 Plus is ideal for vehicle owners who want a dependable, no-frills diagnostic tool to check engine faults and battery condition themselves. It suits weekend mechanics, used-car buyers, fleet managers and commuters who prefer to verify issues before paying for shop labor. If you need deeper module programming, ABS/SRS diagnostics, or battery registration for modern vehicles, a more advanced service tool would be required, but for straightforward engine codes and 12V battery checks the NT301 Plus provides clear, practical results that often prevent unnecessary shop trips.