I may be barking up the wrong ECU but I post ith good intentions.

If I read correctly, you changed the CAT.
I understand that original CATs are not available or if they are, several hundred pounds (compared to a couple of hundred).
These CATs do not behave the same as original CATs and will cause an error at the ECU.

If I am barking at myself again, apologies. If there is any grain of sense, then I strongly advise you to call Mark at Kmaps.
He was the fuel and emissions engineer for these cars when they were in production (citation needed) and knows more about ECUs, replacement CATs and anything else about what comes out of the engine and how the ECU deals with it, than I have had hot dinners.

Good luck.

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