WBO Overview


External WBO

  • External controller with analog output, like then AEM 30-4110 and similar products.
  • External controller with CAN interface, like the AEM X-Series wideband controller/gauge.

rusEFI Wide band oxygen

See rusEFI-Wideband-Controller

See Hellen-WBO

Naming Convention

pin 1 red: IP=Pump Current

pin 2 yellow: VS/IP=VM=common virtual ground for VS and IP

pin 3 white: H- Heater control, low-side

pin 4 grey: H+ Constant +12v

pin 5 green: R Trim=Calibration resistor

pin 6 black: UN = Vs = sensor voltage output = INRC

4.9 pinout courtesy of https://www.wbo2.com/cable/lsuconns.htm



uaEFI Connector Pinout


Part Numbers

Connector Shells

Connector Part Number
Female (harness) 1928404669
Male (sensor) 1928405111

Male connector is only needed when building extension harnesses. The connector on the sensor contains a laser-trimmed calibration resistor and should not be removed.

Female Terminals for Harness Side

Wire Size Plating Strip Loose
24-22 AWG Tin 1564324-1 1564325-1
24-22 AWG Gold 1564324-2 1564325-2
20-18 AWG Tin 1241380-1 1241381-1
20-18 AWG Gold 1241380-2 1241381-2
16 AWG Tin 1418884-1 1418885-1
16 AWG Gold unavailable unavailable

Part numbers provided by and available for purchase at corsa-technic.com individually or as a kit. https://www.corsa-technic.com/item.php?item_id=1296

Sensor Part Numbers

BOSCH 17011 '2013 kia rio 1.6l l4 oxygen (o2) sensor Upstream`

BOSCH 17321 2012 ford focus Upstream

See also https://rusefi.com/forum/viewtopic.php?p=43513


1J0973705 8R0906262E


  • CJ125 is an unavailable old chip replaced by CJ135. CJ125 is not available from legit distributors for many years now. There is no documentation for CJ135. Some time ago we chose to no longer spend resources on CJ125.