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The oxygen sensors (also called O2 sensors) are one of the most important elements of the modern fuel injection system.If you find your oxygen sensor was broken,you need to replace new oxygen sensor.So here I want to share the steps to replace oxygen sensor for Mercedes Benz.
Time: 2 hours
Tab: $95 to $800
Talent: 3
Tools: 22mm wrench, 22mm crow’s-foot wrench, jack stands, floor jack,wheel chocks, safety glasses, torque wrench
Applies to: C350 (2007-14), SLK350 (2004-14), CLS350 (2004-14), CLK350 (2005-14), E350 (2005-14), S350 (2005-14), SL350 (2005-14), R350 (2006-14), ML350 (2006-14), Viano (2005-14), Sprinter (2006-14), CLC350 (2008-14), GLK350 (2008-12)
Procedures:
You need to remove the front (red arrow) and rear (yellow arrow) engine covers along with the air ducts (green arrows).Please see article: How to Remove Benz C Class W204 Engine Cover
There are four O2 sensors on the C350:two pre-catalytic convertors (yellow arrows) and two at the rear of the cats (red arrows).The wiring connection are located on the lower sides of the bell housing (green arrows).
This photo shows the two sensors on the left side,the pre-cat (red arrow) and the cat sensor (yellow arrow).There sensors are NOT interchangeable.The right side is the same as the left though.
Both sensors connect to the wiring harness on the lower side of the bell housing.The connection for the pre-cat sensor (red arrow) is different from the cat sensor (yellow arrow) so you can
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