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'99 Mercury Sable Wagon

3.0L DOHC Duratec 24 valve 

Is there such a thing as a chart or listing showing min and max values for the Mass Air Flow sensor, and the O2 sensors? 

Thanks 

 

 

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  • 3 weeks later...

MAF values are usually between 0.1-5.0V. O2 values are usually 0.1-1.0V.

On a scope, MAF graphed values will switch back and forth from low to high with increasing frequency as airflow increases. Upstream O2 values will also switch back and forth with regular frequency. Downstream O2 sensors should maintain a solid value. 
 

“Lazy” or old upstream O2 sensors may switch at a slower rate, but it’s fine as long as the values are consistent, switching the full range of voltages. Bad downstream sensors will show inconsistent readings. 

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