Exhaust Emission System - N18: Notes

The engine satisfies the EURO 5 exhaust emission standards, or LEVII with the US version (LEV = Low Emission Vehicle). The engine has a catalytic converter close to the engine. The US version also has a catalytic converter on the vehicle underbody. 2 oxygen sensors are used for the oxygen sensor emissions control. A broadband oxygen sensor (Bosch: LSU advanced type) is used as the control sensor upstream of the catalytic converter close to the engine. A bistable sensor (NTK: FLO type) serves as the monitoring sensor downstream of the catalytic converter.