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Here's some advice about using a Bosch 4 wire 02 sensor in place of the stock unit. Cut the four wires between the original O2 sensor and the plug. Make sure to leave enough room to splice the new sensor wires. Don't bother trying to solder the connections. The sensor uses stainless steel wire, and it's almost impossible to solder. Use the crimp connectors that are included with the new Bosch O2 sensor. Just pull them to ensure the connection is good. You may want to heat shrink them when you're done.
| Wire colors on the new O2 Sensor | Wire colors on the old O2 Sensor | |
| Grey (signal ground) | White | |
| White (heater) | Black | |
| White (heater) | Black | |
| Black (signal) | Blue |
Note: The wire colors on your OEM O2 sensor may differ from the one I listed.
A Mercedes-Benz with a V8/V6 and ME 2.8, the O2 sensor is Bosch part number 15736 ($85) for the downstream and Bosch part number 15733 ($67) for the upstream. A Mercedes-Benz with a V8/V6 and ME 2.0 a Bosch 15738 in all four locations.
A Porsche 3.2 Carrera and the 964 use a a Bosch 15735. A 993 uses a a Bosch 15738 (all four). The 996 and 997 use a a Bosch 15733 (only the downstream sensors have been confirmed as working on the 997).