New improved firmware

Low-cost, complete wideband O2 Controller suitable as universal stand-alone applications or additional onboard SM3+ ECU lambda controller.

Our custom wideband sensor heating cycle is continuous monitored, avoiding overheating and destroying sensors!

Due to the perfectly closed-loop temperature control; the Tiny O2 Controller is accurate, responsive and reliable on any application.

The screen only shows values in Lambda, for the simple reason Lambda is independent of fuel type.

The optional O-led screen has great visability day or night and makes it very easy to read under any circumstances.

CANbus version also available Here


  • Molex Connectors included
  • Direct copy of our SM3 integrated wideband controller, wich has proven stability and accuracy.
  • Small size 43x36mm 
  • AEC Q100 graded
  • Bosch O2 wideband (CJ125 V8mode)
  • Closed Loop PID temperature control
  • Does not require Free Air Calibration; Utilizes Bosch LSU 4.9's built-in calibration resistor
  • Operating Voltage 8-18V@3A 
  • Integrated 5v Power Supply
  • Linear Output: 0V = AFR 22   4V = AFR 9 (new mid-2022 release)
  • Visual LED status 
  • External ground triggering (delayed) start possibility


  • Optional I2C-O-Led display to monitor real time temp and lambda values
  • LEAN-BURN version (Wood/diesel LEAN burning applications)
  • Pre-Printed PETG case

For easy integration we'll share the layout so the controllers can be integrated in to own projects...

Will be shipped with the same CANBUS firmware but the CANBUS hardware is not populated.

And a printable file with wildly available GoPro Mounting/Car vent support. (see downloads)

Tiny Wideband Manual,layout&3D files
Tiny Wideband Manual pre-canbus release

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Tiny O2 Controller

  • Product Code: Tiny O2 Controller
  • Reward Points: 5
  • Availability: 10
  • 72.60€

  • Ex Tax: 60.00€
  • Price in reward points: 72

  • 10 or more 60.50€

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