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  #1  
Old 07-22-2003, 02:47 AM
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Join Date: Oct 2002
Posts: 55
Help, please! Not sure if need to replace MAS

Here's what the MB technician wrote on my reciept.

676010 1.0 A TEST ENGINE CHECK AND ADJUSTMENTS CODE PO170 AND PO173 TEST FUEL PRESSURE FOUND 3.8 BAR TEST AIRMASS SUPPLY VOLTAGE FOUND 13.4 VOLTS TEST KEY ON VOLTAGE FOUND 1.07 VOLTS HIGH RECOMMEND REPLACEMENT OF AIRMASS.

After reading the tech's comment, do you think I should replace the Air Mass Sensor?
I am also quite curious about pulling out faulty codes. Can I pull out the codes myself without any scanner?

If I do need to replace the Air Mass Sensor, is there anything I should be watchful of when doing it, such as wearing a glove or taking any precautionary measures?

Do I really need to have the dealer reset the faulty codes?

Thank you for your comments.
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  #2  
Old 07-22-2003, 03:57 PM
DR.DIESEL's Avatar
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Join Date: Mar 2003
Location: Puget Sound, Washington St.
Posts: 522
Any time the HFM sensor voltage exceeds 1.03v with engine not running, the sensor is faulty. 1.07V is usually the voltage these read when code PO170 and 173 are present.
I would also recommend replacement at this time.
Make sure the air filter is not leaking or pinched around the seal.
check all seals, pipes, and clamps. Dirt is a airmass sensor's
worst enemy.
The codes can be pulled with a universal obd2 scan tool.
the codes will need to be cleared and self adaptation reset
after the sensor replacement.
I would have a MB shop do this.
Good luck.
DR.D
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  #3  
Old 07-22-2003, 11:04 PM
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Join Date: Oct 2002
Posts: 55
Thank you so much for your input. I will be getting a new air mass sensor tomorrow and install it myself. Is there anything I should be watchful of since I am a first timer? You also mentioned that I should check the pipe, clamps and air filter compartment for excessive dirt. Should I kinda of vaccum around the parameter where I will be putting the new air mass sensor to get rid of dust and dirt particles? Also my last question is if I use the original Mercedes air filter, will the excessive oil be a concern for me as well? Do you recommend changing the air filter at the same time? Thank you.
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