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[Opelduude]

New heater matrix in place but now i'm struggling to get one of the quick connectors to lock. Useless plastic system.
The hose won't lock with the plastic clip in the outer or inner position. 

[Doctor Gollum]

They take some force to remove/fit

Obviously make sure the seal and collar are correctly located

[Nick W]

I hope you mean cam locking KIT along with a NEW water pump 

the locking KIT for a 2.2 is just a wedge for the cams. Fewer pulleys and adjusters with only one belt run mean there's less to hold in position.

[Opelduude]

Replaced both of the o2 sensors today and gained at least 15 more horsepower. Seems like the car is good to go right now. See how long it lasts

[Opelduude]

It lasted until today when the engine warning light came on a gave me a P0420 code.
Catalyst System Efficiency Below Threshold...

[Opelduude]

I have found out that the content of the cat probably has been removed. Saw some welding marks on it that does not look original.
That explains why i get the fault codes.

The car has slowly started to become more sluggish again. Hesitates and sometimes even jerks a couple of times when i tow a trailer.

[Enceladus]

Try disconnecting the downstream lambda sensor and re-connecting. IE break and remake the connector. What make are the new sensors?

Or possibly the matrix in the downstream cat has fractured and is moving about. Thump it with the side of your clenched fist, make sure the cat is cold first. Listen carefully, can you hear the matrix rattling?

Where is the non-original welding? Ends of the flexi-joint? Or at the pre-cat?

[Opelduude]

The is a square welding mark on the center of the cat. Not professionally looking to say the least. There is only one cat on this as i can see?
No rattle noises at all.

The "new" sensors which i replaced last autumn was Denso and Bosch. Could only get one with the right connector so had to buy a universal one from Bosch. The wires are joined with proper cable lugs. The kind you melt at each end.

[Enceladus]

On the Z22XE the down-pipe from the manifold normally has two cats. A smaller pre-cat visible in the engine bay immediately downstream of the first lambda sensor. The larger main cat is further downstream just before the center silencer boxes.

If the car is Norwegian market maybe less onerous emission standards applied when new, but I would have thought it unlikely. More probable that the car was built like all the others to be Euro IV compliant.

So if you only have one cat in the down-pipe but two lambda sensors then somebody has cut out one of the cats, likely the upstream, and bridged the gap. Might it be that the square welding in the main cat is a patch to fix a hole? The other possibility is that somebody has fitted an earlier 2.0L down-pipe, but these have only one lambda, but easily modified.

It might help if you could get the tailpipe emissions measured? And a trace of the lambda signal and the fuel trims.