I have split your question into a seperate thread as it did not make relevance with the one you placed it in
These plugs are the standard Bosch plugs and they are designed to be difficult to remove, but as long as you don't pull the wire, you will not risk breaking anything by pulling. There are no tabs to press, but there's a locking wire around the plug which will have to be pulled past the tabs on the connector on the TPS.
I suggest you fiddle some more
- Anders