Buying a Rav4 2.2 D4D 136 hp from 2006 – please ask for tips

Hello dear RAV friends, short to me, I am currently driving an Audi A6, which is basically ok, but I would like to have a good and compact SUV, which is on the one hand good to drive, offers space and also quality. Basically I am not a Toyota fan or I actually have hardly any experience with the brand. However, a good friend bought a RAV4 from 2006 with the 2.2 D-4D machine a few months ago, it is the 136 hp version ohn DPF and D-Cat. He is totally z The car has already done it to me. Now we have one in the area with a Toyota dealer who looks really nice, has good equipment and also seems relatively interesting in price. I have the conversation with the salesman at the earliest next week, since he is not in the house at the moment, but I would like to prepare something for it professionally. What do I have to pay attention to with this car? He has 90,000 km on the clock, has an AHK (clothes only with 7-Pol), cruise control, air conditioning Omatics, E-FH, etc. I would be grateful if I could give you some helpful tips. What are the flaws in the car that should be taken into account when buying used cars? Although the dealer gives 3 years of used car warranty, you do not have to buy the cat in the bag. Thank you very much….