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O2 Sensor valve fouled

flabob1

flabob1

Regular Contributor
I have twin 2005 Yamaha 150 HPDI engines. They just went over 900 hours. The right engine O2 sensor valve is fouled bad. ( By valve I mean the small plunger if that's what it's called ? )The left engine is clean with out any deposits. It's been doing this for a while but really caked up this time. I do use more oil on the right About 25% more on each trip. Both engines idle OK and OK at top end. Is there any oil adjustment that could be done or should just leave well enough alone and just keep cleaning the valve
 
Not in the last few months . I know it's possible when the lube works it will foul , also plugs to some what. But it's only on one engine and more oil is being used on the same engine. Got any ideas. Will appreciate it, Bob
 
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