2007 Toyota Matrix shaky/rough steering at hwy speeds

Hello, I would start with the winter tires. If your winter is almost over, change to your summer tires and see what happens. Good Luck!

I would agree your tires are the most probable cause of your symptoms, I had the same issue a few years ago tires couldn't be balanced (bad tires) got replacements and no more shaking, try your summer tires and see if there is a recall for those. also consider a 4 wheel alingnment

Also fuel sys. has nothing to do with shaky steering wheel...Ever!

There is an old rule when it comes to cars and vibrations etc. when you change from summer to winter tires. If there is a vibration, take the winters back off and put the summers back on. 99% of the time it will be a tire issue. Storage of winter tires is something most people don't think about and when they get older they will show up issues.

Always store your winter tires laying down, then have them balanced when you first put them on for the season. Also the shaking could be caused by a warped brake rotor.

I figured ill pack down the responses some more and say I agree with the others about the tires. I had this issue with mine at higher speeds with summer tires and winter tires separately.in the winter wheels can develop flat spots from sitting or packed snow can accumulate and freze to throw the balance off. The vibe/matrix requires those sticky wheel weights and if the tire shop doesn't clean the rim first they will fall off easily and throw off the balance. Engine will rarely if ever cause shaking in steering wheel unless its severely misfiring or similar issue in which case you'd feel it at all speeds not just highway. Most dealer employees don't know a single thing about cars so I wouldn't take what they say to heart unless they are relaying information from the actual technician. They may just be trying to sell things or just trying to make you feel better by giving the illusion of knowledge and having potential solutions.

I had this problem with my old 2007 Toyota Matrix (Base) (192k). The car ran perfectly in every respect but wheel vibrations when driving over 40 mph. Never died, started right up, quiet engine, ride, etc. I also thought the problem was tire-related. Balanced the tires and rotated. Wheel still vibrated. Took the car to the shop--the problem was with the calipers. Had to spend $700 to repair front brakes which were locked. Moral here is this. If you have problems with a vibrating steering wheel, check the braking system first. I still follow the regular maintenance schedule for my Matrix; it's never failed me, but Toyota missed this. No problems were dectected at the last maintenace visit to them and that was 2 months earlier. Hope my 2 cents worth helps.

I meant to say "steering wheel" vibrated to my post above. Sorry...