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Old 02-27-2003, 09:08 AM
Posts: n/a
Originally posted by carman850
I always wonder why almost all modern V8/V6 engines start to use 2 upstream O2 sensors, 1 per cylinder bank, plus at least 1 downstream O2 sensor, that's more than MB M119's single O2 sensor.

The upstream O2's on each bank monitor combustion efficiency, thus control fuel trim on each bank, because on MPI, SFI and others, each bank has its own fuel delivery system.

The downstream O2's monitor catalyst efficiency, all for the sake of cleaner exhaust.
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