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I looked in side the EMC and it looks like swapping EPROMs would be difficult, surface mounted pcb.

I was getting a code p0150. O2 sensor, pre cat bank 2. I changed the sensor, code came back. Upgraded my code scanner software so I could plot O2 sensor voltages. Only very small voltage from sensor, .01 v, fluctuating slightly. I ohmed out the wiring harness between the ECU and O2 sensor...

I think I damaged an O2 sensor input to my EMC while troubleshooting a O2 sensor problem. Does anyone know if the EPROM is in a socket, and does that hold all programming data? I would like to buy a used EMC and swap the EPROM if possible. It is an 03 Discovery S 4.6 with a Bosch 0261204895 EMC...