Yeti 1,2l,2010, engine problems, worth repair yet

Hello, we still have a Yeti 1,2l, petrol, built in 2010, 164.000 km, switchcar. Should be driven to the TÜV in March and a few more years. Was very satisfied so far. Unfortunately engine problems, engine in emergency run, 3 warning lamps light up. In the workshop my mechanic said after testing, for exact damage detection the cylinder head would have to be lowered. That is without the cost for the actual damage already € 800-1,000,- Down oil outlet, i.e. no TÜV acceptance. My mechanic thinks selling in this condition and buying new used ones. It doesn’t hold anything from the small gasoline engines and would recommend a diesel, 2l. My driving performance is about 10-15,000 km/year What would you recommend ?. Repair or sell and switch to diesel. Can you buy a 2l diesel yeti with higher mileage (about 100,000 km) as a switchcar or there are also problems. Thank you for your decision help. Greeting Loty