* Jetta 2.5L: This trim came standard with a 2.5-liter inline-five cylinder engine.
* Jetta 2.0T: This trim came standard with a 2.0-liter turbocharged inline-four cylinder engine.
So, the base engine for the 2009 Jetta is either a 2.5-liter inline-five or a 2.0-liter turbocharged inline-four, depending on the specific trim level.