FOXWELL NT201 OBD2 Code Reader
- 1996 and newer gasoline vehicles sold in the US
- Engine and emissions only, no ABS, airbag or transmission
- One-key I/M readiness with red/yellow/green lights
- 2.4-inch color screen with live data
- Live O2 sensor test on CAN vehicles
- No battery needed, powered by the port
- Lifetime free updates
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A plug in engine code reader for drivers who want to see why the check engine light is on and whether the car will pass emissions. It does not read brakes, airbags or transmissions.
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ASIN: B01N6RKE29Model: NT201Category: Code Readers & Scan Tools
Overview
Drivers who see a check engine light get a reader that shows the fault in seconds. Plug it into the diagnostic port under the dash, read and clear codes, check emissions readiness with one key and watch live sensor data on the screen.
Simplicity is the point: no battery, no app and a one key emissions check. Coverage stops at engine and emissions, and it will not work on electric cars or heavy diesel trucks.
Who it's for
Everyday drivers and first time DIYers checking a warning light will manage it without help. Owners of electric vehicles or heavy trucks need a different tool.
Pros and cons
- One-key emissions check
- Color screen with live data
- Oxygen sensor test mode
- No battery or app needed
- Engine and emissions only
- Excludes electric vehicles
- Excludes heavy-duty diesel trucks
Performance notes
It draws power from the vehicle port, so it starts as soon as it is plugged in. Readiness results come from the car's own emissions monitors, shown as colored lights. Live data and oxygen sensor readings help trace fuel mixture issues on supported vehicles.
Specifications
| Brand | Foxwell |
|---|---|
| Model | NT201 |
| Dimensions & fit | |
| Screen size | 2.4-inch color |
| Power & efficiency | |
| Power Source | Vehicle OBD2 port, no battery |
| Other details | |
| Vehicle coverage | 1996 and newer gasoline vehicles sold in the US, incl. hybrids |
| Software updates | Lifetime free updates |
| Systems covered | Engine and emissions |
| Additional features | One-key I/M readiness, live data, live O2 sensor test (CAN) |
Frequently asked questions
How do I set up the FOXWELL NT201?
Locate the OBD2 port, usually under the dashboard, plug in the scanner and power it on. No external power source or battery is required.
Will it read ABS or airbag codes?
No. It is for engine and emissions diagnostics only.
Does it work on electric cars?
No. It does not work with electric vehicles or 24V heavy-duty trucks.
Can it check smog readiness?
Yes. A dedicated I/M readiness hotkey shows monitor status with red, yellow and green lights.