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Hi, Does anyone know how many oxygen sensors a 2001 ML 320 have and where are they located? I've also seen different configurations of sensors for the same model. i.e. Universal, OE, 1 wire, 2 wires, 3 wires, etc. Any enlightenment?

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4 sensors. 2 on each side. Just before and just after the first catalytic converter on both sides. 4 wires on each. 2 for heaters, 2 for the signals.
 

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Ok everyone after checking my 2000 ML I found the oxygen sensor are in the same place as the ML 2001. It must be a standard with Mercedes because my SL 500 is the same.
 
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