If you remove the outer protective tube then the inner protective tube becomes visible as shown below. These are designed as a passage to allow exhaust gas to reach and pass over the sensing element as quickly as possible while trying to block contaminants and water droplets that could damage the sensor (more on that later). However, it isn’t a short article, so if you don’t feel like reading the whole thing then feel free to jump to the bullet points at the end. Once you understand how to avoid the common mistakes you should be able to get much better life out of these sensors.Īll Bosch LSU sensors we have seen have two protective tubes which cover the internal sensing element. We’ll do this without getting into complex explanations of how these sensors work and all of the concepts discussed will be pretty easy for anyone to grasp. This article attempts to explain why this is. Yet in aftermarket performance installations it isn’t uncommon to hear of LSU sensors lasting for much shorter periods of time and in some cases failing very quickly. On production vehicles it is common for these sensors to last for over well over 100,000kms. We also, know that these sensors live in the harshest environment of all automotive sensors, but even so they have been designed with this in mind. Their common use as a mass-produced part has driven the cost of these sensors down significantly over the years and they have become very popular in the after-market performance tuning industry. Their LSU range of wide-band sensors has been widely adopted by the OEMs and can be found on a huge number of production vehicles to accurately measure Lambda or the air/fuel ratio (AFR) in the exhaust system. Bosch is the world’s leading manufacturer of exhaust gas oxygen sensors.
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January 2023
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