Diagnostics tells us the right bank O2 sensor needs to be replaced on a 98 ML320 with 95K. There's no mention of whether it is the front or rear O2 sensor, though I didn't see an O2 sensor after the converter when I was under the vehicle.

Must I use the expensive replacement O2 sensor, or is there a generic sensor that works and is cheaper, like the Mustang 302 sensor for the 95 E320?

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95 E320 Cabriolet, 169K