[Mk2] [Turbo] AGH!! ECU error codes!

[unyonion]

Ok got a new lambda sensor so plugged in, reset ECU and all was working, 5 mins down the road the dredded light came on!!

So no error for lambda anymore but I still have:

Error code - 23?

Error code - 42:

As far as I know there is no error code 23!! (code 22= water temp sensors & 24 is air intake sensor)

Code 42 details are:
VEHICLE SPEED SENSOR SIGNAL CIRCUIT--NO SPD. SIGNAL FOR SEVERAL SECONDS

WHILE VEHICLE IS OPERATED UNDER HEAVY LOAD (TPS/MAP/AIR FLOW INPUTS)

--SPEED SENSOR/CIRCUIT

--ECU

So how do I sort this out? could it be anything to do with a de-limiter? as I transferred one from my old 2 to this one but never had any probs with it on there?

And anything on the code 23 please?

Thanks a lot Mark