Yep .. your S500 has a M119 engine. MB has both a 4.2l and 5.0l m119 engine. I have the 4.2l
Sounds like the 02 replacement is in order. I would however caution on replacing parts without proper diagnostics while chasing a problem.
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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML
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