Mechanics

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1998 Mercedes Benz CLK320 • 26,000 miles

I got an check engine code of: PO170 (BANK 1) AND PO173 (BANK2) I REPLACED THE maf BUT NO LUCK
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BTOURES
November 24, 2011.



Probable causes of an engine running rich are as follows: 1. Excessive fuel pressure can be cause by restricted fuel return line

2. Defective Oxygen Sensors.

3. Leaking injectors and fuel pressure regulator.

4. Coolant temperature sensor out of calibration.

5. Restricted air intake system.

Rasmataz
Nov 24, 2011.