P0120

What does P0120 mean?

A fault in the throttle or pedal-position sensor circuit.

Can I drive with P0120?

A steady check-engine light with the car otherwise behaving normally usually means you can drive carefully to get it diagnosed — but a flashing light, shaking, lost power, or a strong fuel smell changes that. When in doubt, treat it as more serious. See Can I Drive It? for a quick read on your exact symptoms.

Common symptoms

• Check engine light
• Hesitation or surging
• Reduced power or a limp mode
• Rough or unstable idle

Possible causes

Possible causes include — not “the part is definitely bad”:

• A wiring or connector fault
• A failing throttle or pedal sensor
• A throttle-body issue

What P0120 does not prove

It does not prove the throttle sensor or throttle body has failed — the same code can come from wiring, connectors, or a correlation problem between sensors.

What you can safely check

• Whether the light is steady or flashing
• Whether the car has dropped into a reduced-power mode
• That the throttle and pedal feel normal

What a shop may check

An example diagnostic direction, not a guaranteed procedure:

• Scan tool and live throttle and pedal-position data
• The wiring and connectors
• The throttle body and its motor where fitted
• A check for correlation faults between sensors

What not to do

• Don’t clean or replace the throttle body blindly
• Don’t keep driving hard in a reduced-power mode without diagnosis

Generic OBD-II guidance — manufacturer-specific codes and causes vary by make, so always confirm against your vehicle. A code identifies a system or condition; it does not, on its own, prove which part has failed.