I have a 2011 Toyota Sienna v6 with 170k miles with all services up to date. We are traveling from Oregon to Wyoming. with that many miles and age should I replace the alternator or what items outside of routine Maintenance should I look at. thanks for sharing all your Knowledge with us.
You mention all your services are up to date, including the automatic transmission fluid change? Other than what the manual calls for in terms of maintenance, before your road trip just check the tire pressure in all 4 tires (make sure they are at the recommended PSIs) and make sure the tire still has life in it (look at the tire wear indicator or wear bars) , then pop the hood and check the oil, power steering, brake, ATF fluid, windshield wiper levels are all OK, look for any leaks, check to make sure your AC kicks on when it is supposed to, check the charging system (battery/alternator) to make sure it’s at the proper voltage (Scotty has a video on that), make sure belts are not cracked/frayed. Also, how old is your battery? You can always load test - very easy and Scotty has a video on that. If you have a scan tool, and it does it, you can scan all the computer modules on board and see if any faults pop up.
Otherwise, I wouldn’t change anything out; you can sometimes create new problems that way.
Make sure brakes are in good shape, fluids topped up, serpentine belt good, tires with enough tread, spare tire aired up, jack and emergency kit in good shape, booster cables on hand.
Anything else shouldn't suddenly blow up in the next 800mi and can be dealt with along the way.
The others above have covered what you should do but other than that check your owners manual to see what should be done at this mileage. Day Walker makes a good point with the atf change.
https://www.toyota.com/owners/
Pack for all the seasons!!! I'm out here in Douglas, WY and we are in the stages of freezing cold nights and warm and VERY VERY VERY WINDY days.
If you have some money to spend. Buy headlight bulbs that reach out far as you can just in case of wildlife.
Check suspension by lifting the side of the car up with small jack that came with the spare. Have someone hold the steering wheel and watch for play in the front tires. Check the CV axle rubber boots for cracking and loose clamps. Check the spare itself for cracking rubber and tire pressure
