Stop at Autozone and ask the counter person to hook up the code reader. It will tell you if the TPS is bad. You (as the driver) will have an idea because sometimes your idle will be high, sometimes low, making the engine seem to run rough at times. If you drive a manual tranny, the shifting engine speed (clutch depressed between gears) might not be correct.
P0121 - Throttle Pedal Sensor Switch "A" Circuit Range/Performance. Most common fix is to replace the Throttle position sensor.
The throttle position sensor is the three wire sensor on the throttle body opposite of where the cables attach.
On the throttle body.
The throttle position sensor is on top of the engine, on the throttle body, opposite of where the cables attach.
On the Throttle body!
its located on the side of the throttle body
No.
The throttle position sensor is located on the throttle body. If you follow the throttle cables to the throttle body the TPS will be on the oposite side of the throttle body as the cables attach to.
ON THE THROTTLE BODY, BULK HEAD SIDE.
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.
your tps or throttle position sensor
How to install tps