Delivery date: 3-5 days
PRICE BREAKS - The more you buy, the more you save
WB D2 Wideband gauge and the Bosch LSU4.2 O2 sensor as a complete kit.
Availability: Out of stock
+ -

D2 WB Wideband Gauges

1 – One of the four LED display color options ( Red / Blue / White / Orange)
2 Configurable four types of fuel (E85, Diesel, Gasoline, Methanol) and lambda display (Faceplates are sold as accessories)
3 – Sweeping LED "needle" indicator from rich (green) then normal (orange) to lean (red)
6 – Fail safe LOCKED connector - it is not possible to make a wrong connection
7 – Two ANTI-GLARE faceplates (black or white) options (Comes with only one selected color)
8 – Multiple outputs for digital (to PC), analog (to data logger / EMS), narrowband for simulation and extra switch options
9 – On gauge programming - No need a PC or tablet for programming upper/lower limits and other settings

Less Wiring & Simple Installation
There is only Oxygen Sensor and output cables to be connected. Works with only Bosch LSU4.2 Wideband Oxygen Sensor (Part#17014) NOT INCLUDED!

WB D2 uses automotive grade plastic which is different than ABS. It lasts much longer and more durable for extreme temperature conditions. ABS gets very brittle after a year by just sitting in the vehicle.

1 – Analog 0-5V linear output for engine management systems (EMS) and data loggers (MegaSquirt)
Lower and upper limits are 9 AFR and 19 AFR (0V = 9 AFR, 5V = 19 AFR). Analog output is Megasquirt compatible.
2 – Digital output is 9600 8N1 serial that can be connected to your PC
3 – Simulated NB output
Soft Start technology protects oxygen sensor for damages.
* The low and high limits for analog and simulated NB (NarrowBand) can be modified using the setup procedure.
Oxygen sensor can get very hot when powered. Keep the oxygen sensor powered when the engine is running to prevent damage to the O2 sensor.
It can draw up to 3A momentarily. Normally suggested to use 5A fused system. After the startup, it will use less than 1A average.
Red power cable goes to 12V source in your vehicle.
Black cable goes to a grounded source such as battery ground (-) post.
Green digital output is 9600 8N1 serial that can be connected to your PC.
If you want to connect other devices such as data loggers or AFR gauges, you can use white analog cable for 0-5V output.
Orange narrowband cable is for simulated NB.
The sensor cable (8ft) should be routed in a way so that there would not be any contact with the exhaust piping and other extreme heat sources to prevent damage to the wiring.
Weld the bung at least 24” downstream of exhaust port outlet or 24” after the turbocharger. It should always be before the Catalytic Converter. Also it should be before the X or H pipe if there is. Bung should be welded on the upper section which is located between 10AM or 2AM clock positions. Please check your vehicle for exhaust leaks, camshaft overlap and open exhausts because those would cause false lean readings. Not following these directions may result in premature failure of the sensor.
CALIBRATION - You need to calibrate if you have a new sensor.
The O2 sensor should be exposed to free air for the first time calibration, if needed. Hold the button back of D2, you will see display unit counting from 1 to 6.
Hold the button until you see 6 and release it to complete the calibration. This should take less than 30 seconds.
Once it calibrated, display reads 19.0 at gasoline settings. You can now connect the O2 Sensor onto the exhaust pipe. See the guidelines above. For the factory settings, disconnect power, hold the switch while turning the power on and wait for 3 blinks. You should re-calibrate after this action.
Please note that all WB roducts are tested and calibrated just before they are shipped from Cincinnati, OH validating that they are working properly.

Depending on when you release the button on D2 after holding it, you can modify different settings. Pushing and holding 3 secs will start continuous cycle of 6 menu items. The user can change the fuel type anytime by using the gauge button at the back side as hidden under plastic tab. Just push your finger on the tab and sense the button clicking.

1 – Set the fuel type (1-Lambda [L], 2-E85 [E], 3-Gasoline [A], 4-Diesel [d], 5-Methanol [n]). Default is Gasoline [A].
2 – Set NB lower limit (Range 13-18 Default is 14 - if less than 14 it is "1")
3 – Set NB upper limit (Range 13-18 Default is 15 - if greater than 15 it is "0")
4 – Set Analog lower limit (Default is 9 AFR = 0V)
5 – Set Analog upper limit (Default is 19AFR = 5V)
6 – Calibration (Calibration range we have seen among the Bosch LSU4.2 sensors 70-130)

WB does not pay for the customs fees and taxes and VAT for international orders. That is customers responsibility to pay and receive it when the product comes to customs clearing process stage.

WB does not guarantee the product functionality with any ECU, data logger or other devices that uses the output signals. Implementation and integration of the product with any other device(s) must be done at your own risk. Improper installation and usage may lead to engine damage. Mount and install the product in a location where it does not obstruct the driver’s view and/or ability to safely control the vehicle.
WB warrants this product to be free from defects for 12 months from the date of purchase. Oxygen sensors are excluded from stated warranty. WB’s obligation under warranty shall be limited to repairing or replacing, under the discretion of WB, any part proven defective. This warranty is limited to the repair or replacement of parts in the manufactured good and the necessary labor done to affect its repair or replacement.
In the unlikely event that your WB hardware should fail during the warranty period, a Return Material Authorization number (RMA) must be first retrieved from WB. Support can be contacted through email: at All serviceable goods must be packaged securely, RMA number, with all shipping charges prepaid and shipped to WB. Goods returned under warranty must be received by WB within ten (10) business days after the RMA number has been issued. Goods received after this period is subject to fees for the service of repair or replacement.
WB shall not be liable for direct, special, incidental, or consequential damages resulting from any legal theory including, but not limited to, lost profits, downtime, goodwill, damage, injury to persons, or replacement of equipment and property due to improper installation, integration and/or misuse of any WB’s product(s). This warranty applies to the original purchaser of product and is non-transferable. All implied warranties shall be limited in duration to the said 90 day warranty period.
This warranty shall terminate and WB shall have no obligation pursuant to it if (1) your product has been modified or repaired in a manner not previously authorized by WB in writing, (2) your product was subjected to accident, abuse, shipping damage, or improper use; (3) your product was not used or configured as specified in the this manual; or (4) your product was subjected to operating conditions more severe than those specified in the this manual.
Write your own review Close Review Form
  • Product can be reviewed only after purchasing it
  • Only registered users can write reviews
Customers who bought this item also bought


WB D2 Wideband controller gauge with harness.
From $25.00

WB D2 AFR Controller Gauge Wire Harness

WB D2 Wiring Harness designed to use ONLY with WB D2 AFR Controller Gauge.
From $5.00

WB D1 Wideband AFR Controller Kit

WB D1 Wideband AFR Controller Kit
From $15.00