There is a problem with the throttle posistion sensor
Check the throttle position sensor
i found it easier to remove the throttle body to access the tps sensor. the screws can be somewhat difficult to loosen due to corrosion and position of the sensor.
location of throttle position sensor
Check out the related link for a video on how to replace a crankshaft position on a Ford Focus SE.
On a single cam ford focus 2000-2001 the cam position sensor is below the pcv valve. If looking at the engine it is on the right side, rear, about a 3inches from the top of the engine.
All that you need to do is unscrew if from the suction side and replace it...........
typically they are located on the air intake connected at the throttle body
Where is the coolant temperature sensor on a 2001 ford focus?" Where is the coolant temperature sensor on a 2001 ford focus Where is the coolant temperature sensor on a 2002 ford focus
The easiest way to reset the 2008 Ford focus low tire pressure sensor is to remove the fuse. Keep the fuse out for 10 seconds and then replace it to the original slot.
The best way for removal is to wiggle the sensor while pulling upwards. This speed sensor is known to break during removal, if it does it will have to be drilled out to remove the broken piece.