Salary too low to finance?

Hello forum, I need a little assessment. You can help me / give me tips. My partner and I would like to finance a car next year. Now the problem is that my partner has a negative Schufa. Ergo I can not take her into the financing with me. The financial sins at that time have been “almost” paid off, but the problem is that these remain in the Schufa files for another 3 years. n is the Schufa and I can therefore not take it into the financing, the bank then only calculates with my salary and deducts the large fixed costs such as rent, insurance, cost of living, and an ongoing loan (which is paid off next year) from my salary. (All costs we share) Earnings are actually not bad. We are about 5k net per month. My salary is 2.5k net. Can I use it to finance a car of your Me so far I have always been able to pay cash for my cars and have not yet had any experience in car dealerships with financing. Thank you Yavuz