Most likely the brake switch. Not for sure with this model, but brake switches are almost always easily accessibile being located somwhere in line with the brake pedal.
The 2002 Volkswagen Jetta has 8 valves.
The 2003 Volkswagen Jetta has 8 valves.
The 2010 Volkswagen Jetta has 20 valves.
The 2011 Volkswagen Jetta has 8 valves.
The 2006 Volkswagen Jetta has an inline 5 engine.
The 2009 Volkswagen Jetta is a gas-powered vehicle.
The 2001 Volkswagen Jetta has an inline 4 engine.
The 2011 Volkswagen Jetta is a gas-powered vehicle.
The 2004 Volkswagen Jetta has a 5-speed manual.
The 2005 Volkswagen Jetta is a gas-powered vehicle.
The 2004 Volkswagen Jetta has an inline 4 engine.
The 2010 Volkswagen Jetta is a gas-powered vehicle.