* 1.8L Ecotec: This four-cylinder engine produced 138 horsepower and 125 lb-ft of torque.
* 1.4L Turbo: This turbocharged four-cylinder engine produced 138 horsepower and 148 lb-ft of torque.
So, the 2012 Chevrolet Sonic had either a 1.8L or 1.4L engine.