Hi, sorry for your loss, I hope you're OK.
I can empathise too. I kept my dad's car after he died, then four months later it was written off in an accident (not my fault!). At the time, once I'd ascertained that my passenger and I were both OK, I was relieved that the car was a write-off as I'd found it incredibly hard to look out of the window and see it parked in our drive. Like Nancy'sGarden said, just for a moment I would think "Dad's here" and it was incredibly painful.
Last year my mum died, and I've kept her car and I drive it every day. This time, although I'm still a wreck regarding her death, driving her car doesn't bother me. Probably because she hadn't had the car for very long, so I don't particularly associate it with her.
I have various household objects from my parents' house scattered around my home - plates, pictures, small bits of furniture etc - and I find it comforting to see and handle objects that are so familiar from my childhood.
I can't bring myself to get the jewellery down from the loft though, not sure why but I can't bear to see it. I do sometimes wear a scarf of my mum's (it's the only item of her clothing that I've kept) and I can still smell her perfume on it, which is both unbearably painful and extremely comforting.
I've also kept her dog! And I love this dog sooooo much - when I'm crying or feeling low, she comes and sits on my lap and I invest her with human feelings and talk to her as though she knows what I'm going through. Totally daft, but she's a living link to my mum and this really keeps me going.
I'm going to sign off now before someone calls the men in white coats!