Using my electronic device, I found that the cause of the CEL is PO150 02 sensor in
"Bank 2 - sensor 1"

How do I determine exactly which sensor this is on the ML 320- in order to replace it properly??

Also, do I really need a special tool to remove the sensor or can I do it with the proper socket??

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)