Toyota Yaris: Trailer towing (except 3-door models for Canada)
Toyota does not recommend towing a trailer with your vehicle. Toyota also does not recommend the installation of a tow hitch or the use of a tow hitch carrier for a wheelchair, scooter, bicycle, etc. Your vehicle is not designed for trailer towing or for the use of tow hitch mounted carriers.

Winter driving tips
Carry out the necessary preparations and inspections before driving the vehicle
in winter. Always drive the vehicle in a manner appropriate to the prevailing weather
conditions.
■ Pre-winte ...
Trailer towing (3-door models for Canada)
Your vehicle is designed primarily as a passenger carrying vehicle. Towing
a trailer will have an adverse effect on handling, performance, braking, durability,
and fuel consumption. For your safet ...
See also:
Fit standards
...
Engine immobilizer system
The engine immobilizer system is a theft prevention system. When you insert
the key in the ignition switch, the transponder chip in the key’s head transmits
an electronic code to the vehicle.
...
Service specifications
ENGINE
Valve clearance (engine cold), mm (in.): Intake 0.15—0.25 (0.006—0.010).
Exhaust 0.25—0.35 (0.010—0.014).
Spark plug type: DENSO SK16R11.
NGK IFR5A11.
Spark plug gap, mm(in.):
...