I had the same thing happen after Jiffy Lube changed the air filter. They forgot to plug the vacuum line back into the back of the air filter housing.
front of engine under exhaust manifold
They do not tell you in the manual how to change the filter. They want you to take it to a dealer
2006 Toyota Highlander 4 cylinder engine
Which air filter are you referring to? The engine air filter, or the cabin air filter?
I would like to see the location of oil filter for 2006 Highlander Toyota.
It's in the fuel tank as part of the fuel filter.
Right side toward front of engine will see a 3/8 square drive .It is a element.
I have a 2003 Highlander. Whenever I get the oil changed, the check engine light comes on within a couple of days. I finally figured out that there is a hose under the air filter case that gets disconnected when the filter is checked. Just reattach the hose and the light will reset after a few restarts of the engine.
The "check engine" light is not solely dedicated to the air filter and pcv valve. There are other things that can cause this caution light to illuminate on the dashboard. Assuming you bought this car new and that it has but 37k miles on it, it's most likely still in warranty and Toyota should be fixing this problem for you.
04152-yzza1
Access to it is located behind the glove box.
fuel filter is in the fuel tank, tank must be dropped, not meant to be serviced.