Oxygen sensor replacement on w140 S500
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04-16-2003, 10:43 AM
Join Date: Feb 2003
Location: Ontario, Canada
I am not sure about your particular car but, there are pre-cat & post-cat O2 sensors.
The pre-cat goes before the catalytic converter, whereas the post-cat goes into, or directly behind the converter.
That's about all I can give you, sorry.
2007 C 230 Sport.
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