Bosch LSU 4.2 for Zeitronix Wide Band

It is compatible with Zeitronix Zt-2 and Zt-3 units specifically wired for the LSU 4.2 sensor. Please check your connector shape before ordering, as it differs from the LSU 4.9.

Sensor life depends heavily on usage. In a daily driver, it can last 50,000+ miles, but race applications using leaded fuel or rich mixtures may require replacement much sooner.

Common causes of failure include thermal shock from condensation (improper mounting angle), lead poisoning from race gas, or excessive oil consumption fouling the element.

No, the LSU 4.2 and 4.9 have different internal resistance and connector shapes. You must use the specific sensor version your wideband controller was designed to read.

Yes, unlike the newer 4.9 version, the Bosch LSU 4.2 design generally requires occasional free-air calibration on Zeitronix systems to maintain peak accuracy.