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  #1  
Old 11-14-2001, 12:51 PM
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How to check mass airflow sensor

Is there anyway to check whether the mass
air flow sensor on a 98 E320 is working correctly.
I hate to go out and buy one and found out later
it is the O2 sensors that are bad.
I have a check engine on and using a OBD II scanner,
the code is Trim Fuel malfunction.
Thanks
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  #2  
Old 11-14-2001, 06:17 PM
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If the codes are P0 170 & OR P0 173 then only fuel pressure, vacuum leaks or air mass sensor will cause this!

If your scanner will allow you to veiw LIVE DATA then you can see air mass values.
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Last edited by mbdoc; 11-14-2001 at 06:29 PM.
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  #3  
Old 11-14-2001, 07:49 PM
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It is indeed P0170 & P0173. What should the value be and
what should I look for? thanks alot
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Old 11-14-2001, 09:19 PM
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I would bet money on the mass air meter if there are no vacuum leaks.
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  #5  
Old 11-15-2001, 09:07 AM
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In actual values look at the partial load correction factor, if the value is above 1.25 then the air mass sensor is to blame.
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