My 02 sensor failed and was replaced. The car still failed the emissions test with high CO2 which tells me the previous owner or garage had been adjusting the MAS. The MAS bypass needed to be re adjusted according to the manual to a CO of 0.8%. I have not been able to find anybody local with an engine gas analyzer. Does anybody know what the the initial setting of the bypass screw on the MAS should be? I just want to get it in the ballpark. When you purchase a new or rebuilt unit they must come with an initial setting?