ST201 Automotive Smoke Leak Detector with Built-in Air …

FOXWELL ST201 Automotive Smoke Leak Detector with Built-in Air Pump

Professional smoke leak detector with built-in air pump. Pinpoint vacuum, intake, and EVAP leaks in minutes — no external compressor needed.

4.4 (96 Amazon ratings)
Price on Amazon$149.99

Amazon price checked Jun 14, 2026

Overview

The FOXWELL ST201 smoke leak detector finds vacuum, intake, and EVAP leaks using an integrated air pump — no shop compressor required.

Whether you are troubleshooting a check engine light, preparing for an emissions test, or performing scheduled maintenance, the ST201 gives you the module access and service functions you need without booking a dealer appointment. On-screen menus walk you through each step, and stored scan reports help you track repairs over time.

Key Features

  • Built-in electric air pump
  • Adjustable smoke flow for precise leak detection
  • Works on EVAP, intake, turbo, and vacuum systems
  • Compact case for mobile diagnostics

What You Can Diagnose

The ST201 helps you identify root causes faster by reading fault codes, live sensor values, and module status across the systems it supports:

  • EVAP system leaks causing P0440–P0457 codes
  • Intake manifold and vacuum hose leaks
  • Turbocharger boost and intercooler seal leaks
  • PCV and crankcase ventilation leaks
  • Exhaust and EGR gasket leaks on diesel engines

How to Use This Tool

Connect the ST201 to a 12V power source and attach the smoke output hose to a capped intake or EVAP test point. The built-in pump produces visible vapor — watch for smoke escaping at cracked hoses, loose clamps, or failed seals. Repair the leak, clear related codes, and re-test to confirm the EVAP or vacuum fault is resolved.

Vehicle Compatibility

12V vehicle systems. Use with appropriate adapter caps for your intake or EVAP test point.

Always verify that your exact year, make, model, and engine combination is supported before purchase — especially for service resets, bi-directional tests, and brand-specific modules. OBD2 port location is typically under the driver-side dashboard on U.S. vehicles from 1996 onward.

Who Should Buy This

Shops chasing EVAP codes, boost leaks, and vacuum-related idle issues.

If you regularly work on your own vehicles, run a small repair shop, or buy used cars to flip, the ST201 pays for itself quickly compared to per-visit dealer diagnostics.

Why Choose FOXWELL

FOXWELL has built a reputation for professional-grade automotive diagnostics at a fraction of dealer scan-tool prices. Unlike many subscription-based tools, FOXWELL scanners include free or lifetime firmware updates, clear on-screen DTC definitions, and responsive customer support — making them a practical choice for home garages and independent shops alike.

Connectivity & Software Updates

Standalone 12V power. N/A. Keep firmware current to maintain the widest vehicle coverage and access to newly added service functions.