The throttle position sensor (TPS) may fail. Common symptoms of a defective TPS can be rough idle, hard starting, hesitation on acceleration, poor fuel economy, and stalling.
Problems for specific Ford Crown Victoria years:
Car problem reports
Problem with your car? See what our experts say or submit your own.
Most reported 2006 Ford Crown Victoria problems
The engine may overheat at idle when the AC is on. A new, upgraded fan motor and resistor assembly should be installed.
Transmission problems are common in this model, often as a result of a failed front pump. The pump loses its ability to create hydraulic pressure, which an automatic transmission needs to function. A sign of front pump failure can be a whine type noise.