What causes a P0120 code?

Common causes: Failed TPS; Wiring issue; Dirty throttle body.

What are the symptoms of a P0120 code?

Typical symptoms: Check engine light; Hesitation on acceleration; Stalling; Rough idle.

No — this code can cause damage if you keep driving. Get it diagnosed before continuing. Estimated repair: $80-$300.

OBD-II Code · Sensors

Throttle Position Sensor Malfunction

medium severityDo not drive$80-$300

The TPS isn't reporting throttle position correctly.

Common symptoms

Likely causes

Where to start

Try the cheapest cause first. Start by checking: failed tps.
Cost & scope. $80-$300
If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there. Don't keep driving with this one active — risk of damage.

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