Question about 1999 Mercedes-Benz E-Class

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Engine code in my 1999 mercedesE320 is PO173 what

Engine code in my 1999 mercedes E320 is PO173 what is the cause and how do I repair it?

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Hi, both codes indicates a bad Mass Air Flow Sensor..
The airmass meter is a common problem. CRC makes an aerosol "Mass Air Flow Sensor Cleaner" that you can try to use to clean sensor.It is located in the intake hose between the air filter housing and the throttle body.

Take care

Posted on Aug 03, 2010

  • cwarren8 Aug 30, 2011

    Check for a vacuum leak on the hose coming from the valve cover gasket. 99% of the time the hose is cracked

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Posted on Jan 02, 2017

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that appears to be a camshaft position sensor performance code. you can start by checking to see if the sensor is working properly, re-check and make sure that the harness is ok by checking the resistance through the harness if all looks well there make sure the computer has the latest software on it by having it scanned at your local dealer. also you can check the reluctor wheel on the camshaft for damage or debris in the way of the sensor.

hope this helps!

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Most likely a gas cap or emissions issue, if you are sure the car is running fine. But you will have to have it scanned to know for sure.

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