S320 w221 O2 sensor location

Kay187

Member
Joined
Aug 31, 2012
Messages
55
Location
Scotland
Car
S-class 320 CDI
Hi, my w221 has been running a little rough and I get a bit of smoke now and again when I put the foot down. I scanned codes using my icarsoft and have the bank 1 sensor 1 coming up, can someone point me to the location of this plz? Also any DIY for this and is it a difficult job?

Thanks.
 

AMGeed

Hardcore MB Enthusiast
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Nov 1, 2008
Messages
13,870
Location
Bournemouth/Poole Dorset
Car
2014 E63 Biturbo
You have to remove the undertray, then follow the exhaust up toward the manifold where you will see the primary cats ( one each side on a 320cdi?) the O2 sensor is tapped into the exhaust at this point. If you don't mind working under the car on jackstands its a DIY job. (Please make sure the car is correctly supported and not just on the car jack.)
 

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