BMW 11781739845 Oxygen Sensor

The handling of evaporative fuel vapors from the fuel tank has been made tighter with additional ORVR venting control and enhancement of the fuel tank leakage detection system. The fuel vapour recovery system during refuelling collects and stores hydrocarbon fuel vapour where pressure from the incoming fuel forces the vapours through the breather hose to a container, then into the charcoal canister thus enabling the system to breathe in the right components. To deal with the exhaust emissions, there are four oxygen sensors, two pre-cat and two post-cat. The post-catalyst sensors are traditional heated zirconia systems that produce a steady voltage when running properly, while the precatalyst sensors are Bosch LSU planar wideband types which make use of zirconium oxide ceramic layers for brisk reading over a broad air-fuel mixture range. The sensors especially intended for best operation need the ambient air as a reference gas and it enters the node through the harness connectors. If it malfunctions, the connector ought to be inspected for contamination, cleaned thoroughly and the harness reconnected in order to remove oxidation from the pins.