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Old 07-22-2003, 02:57 PM
DR.DIESEL's Avatar
Senior Member
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.
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