20V Motronic ECU System

1991 200TQ and 1992-95 Audi S4/S6 with 20V Turbo Engine

Bosch Universal Replacement 3 Wire Heated Oxygen Sensor

Bosch makes a universal replacement 3 wire O2 sensor. One example is the Bosch 15735, this generic O2 sensor can be used in the Audis with heated O2 sensors, if you use your original wiring and connectors and splice it to the wires on the new oxygen sensor. The OE replacement with harness the Bosch 13957

I use the smaller gauge (red) butt type crimp connectors to splice the original O2 sensor wiring to the new generic O2 sensor. I cut the O2 sensor wires to have different lengths, so I can space the crimp connectors in different locations to allow them to slide inside the original wire sleave to protect them from the elements.

20V ECU system information index

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