My 2.0 litre 8valve has the follwing problems:
High co levels (only just scraped through an MOT pass)
Hesitation/misfire at low revs under load
Fluctuating RPM (only noticable above idle at steady throttle opening)
Hmm... I hava a 16v and have not changed mine yet. The car did about 143000 km. Well maybe the previous owner did change it, but i got all bills from him and he claimed this was all the work done on the car.
And i know mine works ok, because last time when i had problems starting the logged error was water temperature sensor and lamnda, but when they cleared connectors the readings form both sensors were ok.