Ilmor 02 Sensor MV8V-1018 downstream & upstream play a very important role within your engine. If the 02 sensor is not working correctly, your entire engines performance can fail. Your MasterCraft boats engine will start to run rough and or start to knock, smell like unburnt fuel, and more. As we all should know, there are a lot of different factors that can cause these same symptoms so diagnosing the issue should always take place before just ordering parts.
PART #MV8V-1018