Originally Posted by
deathrider666
I've tried looking for an oxygen/lambda sensor on the exhaust or near the cat but there doesn't seem to be one.
A diesel does NOT have an Oxygen sensor in the exhaust manifold.
If it has an Oxygen sensor it will be behind the DPF.
The reason for the the message "Engine Malfunction" is probably because you disconnected sensors.
Your car uses the can-protocol.
Can you measure the resistance between pins 6 and 14 of the diagnostic connector with the key turned off.