The Bosch LSU 4.2 is an earlier generation Bosch wideband lambda sensor, now largely superseded by the LSU 4.9 but still in use in existing installations and some older wideband controllers. This connector kit (1J0973733-SET) provides the mating connector, six JPT tin-plated terminals, and six rubber seals.
The LSU 4.2 and LSU 4.9 connectors are not interchangeable despite both being 6-pin — housing geometry, pin arrangement, and electrical characteristics differ. Always confirm your sensor generation before ordering.
Kit Contents
| Item |
Quantity |
| Connector housing 1J0973733 |
1 |
| JPT female terminals, 0.5–1.0 mm² |
6 |
| Rubber seals |
6 |
LSU 4.2 vs LSU 4.9
|
LSU 4.2 |
LSU 4.9 |
| Housing |
1J0973733 |
Different housing |
| Connector kit |
1J0973733-SET |
LSU4.9-CON-SET |
| Controller compatibility |
Older wideband controllers |
Current standard — AEM, Innovate, Link, Emtron |
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