On that thought, I scoped the B1S1 & B2S1 O2 sensors this morning on a cold start. The AIR pump runs for about a minute, When it shuts off, the O2 sensors seem to react:

[1996 Jaguar Vanden Plas, ECM/Inputs/Outputs Waveform]

The B1S1 O2 sensors were not cy... Login to read more.

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