Discovery 2.0 MPI emission failure

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XPROISHEEP

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10
Hello everyone, I'm back with my 2.0L MPI Disco!

Of course with issues. Recently went in for an M.O.T test and failed on emissions (high CO)
I checked all the vacuum hoses, all were okay, So I replaced the Oxygen Sensor, the engine seemed to run a bit smoother, so I took it back for it's M.O.T and it failed again on emissions.

So I plugged in my pscan.eu and found that the engine never went into closed loop. So I swapped the ECU with a spare and Hey Presto it did go into closed loop, however it ran very poorly compared to the other ECU.

So I think that both ECU's may be faulty and I require a new one, anyone got any other ideas?
 
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