Breakdowns in two years ... - Toyota Avensis, 1.6 liter, 1997

Two years have passed since the operation of this machine. General impressions are positive. Although not without flaws, but without it, perhaps, nothing. The car is still 11 years old. So, I'll start complaining.
First, the suspension worries. We changed the racks two years ago, and now it's time again. Although it may not be scary on our roads. The front control arm on the right side was also broken off. Although there were no accidents and strong impacts at speed. But the breakdown was detected and fixed in time. (the car began to noticeably "float" on the road, especially when cornering). Otherwise, everything is passable.
Secondly, the indicators of the engine sensors and open doors are disturbing. The engine indicator lights up sometimes when driving, but after slowing down, everything returns to normal. Although no dependence on revs or speed was noticed. And in the book on maintenance it is written simply: "follow to the place of repair." Perhaps there is nothing wrong here, I am sinning on poor quality gasoline. Very often we mix it with diesel fuel. And there are no funds to go to a high-quality service station. The door indicator is opposite, sometimes it does not light up, I try to find where to crawl up to it. (I think bad contact).
Thirdly, the increased noise in the cabin.
Fourthly, the front door handles have become unusable. The bolts for their fastening are torn off.
Fifthly, seat heating refused. I checked the contact, there is current. The pillows themselves must have burned out. But I can't imagine how to replace them. How can you take off the velor and stuff in new pads?
But in general, the car proved to be worthy! Because it is mainly used as a worker.