A 200tdi is normally a good strong engine.
The important part is how long it was run on a strong blend of petrol.
A small % of petrol in the diesel doesn't matter. In colder countries people use petrol as a thinning agent for diesel. The biggest problem is the low cetane value. This can be corrected using additives, but in your case it will get sorted on the next fill up.
I use 1% petrol in mine for thinning veggie oil with a cetane booster, heat the mix, and all has been fine..... so far