Welcome Redruthray,
The error 3 as you have found is a common, and often terminal problem, your budgie....is probably a 'not uncommon' symptom on the 200/300 and there is info on here, recently, on the suspension section, have a good read. Have you any info on cambelt changes..again have a look via search on here on age/mileage recommendations.
Another good check is excessive tyre wear on the inner side...it's all on here.
Just bear in mind that error3, front budgies, inner tyre wear, cambelt precautions......are all normal on the 200/300, there are only a few such items on these cars
My 200/300's have never failed an MOT in ten years, she causes me no significant problems, and would have no hesitation in jumping in and driving 1000 miles right now (apart from the fact I've just got my jim-jams on !).