The Bosch LSU 4.9 connector kit contains the 6-pin mating connector for the LSU 4.9 wideband oxygen sensor — the most widely used wideband lambda sensor in motorsport. The kit includes the housing, six crimp terminals, and six rubber seals. The LSU 4.9 is used with virtually every standalone ECU and wideband controller on the market: AEM, Innovate, Link, Emtron, Bosch Motorsport, and standalone wideband controllers.
Do not confuse with the LSU 4.2 connector kit — both are 6-pin but the housings and pinouts are different and not interchangeable.
LSU 4.9 Pinout
| Pin | Signal | Notes |
|---|---|---|
| 1 | IP — Pump current | From wideband controller |
| 2 | VM — Virtual ground / reference | |
| 3 | Heater − | |
| 4 | Heater + | |
| 5 | IA — Calibration resistor | |
| 6 | UN — Nernst cell voltage |
Compatible Sensors and Applications
| Application | Notes |
|---|---|
| Bosch Motorsport LSU 4.9 100 cm | Direct fit — stocked by XTRA |
| Bosch 0258017025, 0258027xxx | Standard LSU 4.9 variants |
| All AEM, Innovate, Bosch, Link, Emtron wideband controllers | Any controller using LSU 4.9 sensor |
| Bosch DBW throttle body F02U.V01.171-01 | Same 6-pin housing, different application |
| Bosch DBW throttle body 0280.Y05.107-01 | Same 6-pin housing |
| Bosch DBW throttle body F02U.V01.184-01 | Same 6-pin housing |
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