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Either out of gas, the presure sensor is faulty, the compressor is seized or the conector on the compressor has corroded.
Quite a few problems on the megane 2's for this.
Remove bumper, remove 4 13mm bolts on top, loosen 2 23mm bolts behind. Remove two 10mm bolts holding bonnet catch and remove that. Unclip loom from the front, Remove 2 10mm bolts holding upper rad brackets and lift the slam panel away.
I am also a Renault tech. Have you not got the parts? Cambelt kit and aux belt. I can get an all in price for you if you pass me your reg over. I will charge £100 labour.
Eggy smell is not the cat failing, its unburnt fuel going through it.
1st thing I would be doing (especially for flat spots) is getting a diagnostic check for a possible pre cat 02 sensor fault. 182's are notorious for this.
Check all the connections to the relays in the box behind the passenger headlight. Also check all the fuses you can find one by one. (even the big ones).
Are you running a full conversion as in dash loom, uch, 172 key fob?
Or a decoded 172 ECU with your original keys?
Whats the problem? Wont crank? Cranking but not firing? Does the fuel pump prime when you turn the ignition on? Is the little red imobiliser light going out?
Its the spring in the tb you can try cleaning it but imo the only way to fix it is to buy a new one.
Or you can do a ghetto fix like me and a few others on here....(see spring in picture)
If its a phase one then only the central locking will need programming. Ph 2's are different.
XR25 is the old renault diag equipment I wouldnt imagine a snap on solus/ethos would not be able to do it.
All I would do is order the key, put your original blade in it and try and start the car ;)