When is the timing to consider a car replacement? on 2003 Volkswagen Beetle

I have 2003 VW Beetle and close to 66k. The check engine light is on, and went to the dealer for diagnosis. On top of an oxygen sensor failing, they found one of the tie rod needs replacement and costing me $700-800 if fix them both. They also said catalytic converter is in bad shape and could fail in near future. The bad is that the cat is under warranty but expires in a few months. I am debating over fixing them at a local place or going back to the dealer. Any tips?
Real question - I had temperature sensor replaced 3 years ago, battery replaced 2 years ago, in addition to regular maintenances. When is the breakpoint that you should consider replacing a car? The current price of the car supposed to be ~$3500 (Blue Book). Will there be major repairs waiting in the next few years?

Asked by for the 2003 Volkswagen Beetle
At 66,000 it sould not be anything wrong with a vehicle! If you do trade, consider Asian or US mfg. autos. That's my opinion and may be wrong! As for your VW, no way to predict what may or may not happen with any car but from track records and what I have seen in the shop over the YEARS,
some makes do a LOT better than others. Some European makes are sharp rides though i will admit that but it don't help much when you can't ride!
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agree with wetry.but german cars start to have excessive issues after 50k miles, good time to get rid of the poss money pit