Where is the plug or how to refill the transmission oil on a venza 2009

The sensor is usually on the transmission. images in the link.

https://www.google.com/search?q=2009+Toyota+Venza+Vehicle+Speed+Sensor+replacement+-wheel

..

https://fuse-box.info/toyota/toyota-venza-2009-2017-fuses-and-relay

maintenance lights often mean nothing except that a certain period of time or mileage has passed. Whoever changed the oil probably didnt reset the maintenance counter.

• Turn the ignition switch to the On position and ensure that the display screen is in the Trip A mode.
• Turn the ignition switch to the Off position.
• While pressing the TRIP switch button, turn ignition switch On. Hold the button down through the entire reset procedure.
• The odometer indicates 000000 and then returns back to Trip A.

There are two plugs on trany , one drain , one refiil.
Lift car and level it , open refill plug , set aside.
Open Drain plug and drain the oil.
Reinstall drain plug.
Use sifon pump to pump oil in to refill hole.
Fill it up untill oil start coming out of refill hole.
Reinstall refill plug.
You are done.
Plugs are for 22 or 24 mm wrench.One at the bottom the other one at level of drive axle of the transmission.They are same size.

heavy hand tight,in other words do it up tight with one hand and then hit the back of your fist with the other hand.that is heavy hand tight.use a new copper/fibre washer every time.

Take it to a local oil changing place, they should reset it for free or maybe $5. saves you the headache.

If you look at the transmission, you will find a drain plug on the bottom, look for a similar plug on the side of the transmission, take out plug and if oil is at the bottom of side plug hole, trans is full, if not refill here until oil is running out of hole, reinstall plug.