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Bosch LSU 4.9 5-wire wide-band O2 sensor – 3888

5 out of 5 based on 1 customer rating
(1 customer review )
Bosch LSU 4.9 5-wire wide-band O2 sensor - 3888

$84.00 $66.00


3888Bosch LSU 4.9 5-wire, wide-band O2 sensor.

Compatible with the LM-2, LC-2, and MTX-L, SCG-1, DLG-1, PSB-1, and PSN-1.

NOTE: The latest generation widebands are compatible with both the Bosch LSU 4.2 and 4.9. Please note that the sensor connector is different for each sensor. Reference the Sensor/ Sensor cable identifier image below.

Another way to verify which sensor is being used is to connect the unit to the LM Programmer software. Please reference your user manual for more details.

Weight: 1 lb


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1 review for Bosch LSU 4.9 5-wire wide-band O2 sensor – 3888

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    Questions & Answers

    1. 0 votes

      This part number appears to be just a sensor. While most sensors give a simple resistance or voltage based output, wideband oxygen sensors are different. The Bosch LSU sensor combines a Nerst cell (like a narrow band oxygen sensor) combined with an oxygen pump that extracts oxygen from the exhaust to determine the actual air-fuel ratio. It requires a control circuit to drive the pump, and none of its outputs are anything you can plug into a simple analog-to-digital converter and get a reading you can convert to oxygen levels. So a wideband oxygen sensor requires a dedicated controller circuit. As this circuit is not built into Megasquirt, you will need an external control device like an Innovate LC-2 to convert its output into a signal that Megasquirt can read.

    2. 0 votes
      Q What is the thread size on the the sensor? Thanks answer now
      Asked on February 2, 2018 11:40 pm

      M18 x 1.5. This is a metric thread, 18 mm diameter, 1.5 mm between each turn of the thread. Used by most O2 sensors except '80s through mid '90s Toyotas (see our Toyota adapter plate for those) and some motorcycle / ATV applications.