P0120 fault code: what it means

P0120: Throttle position sensor (TPS) A circuit fault.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

1. faulty throttle position sensor or throttle body
2. corroded or loose throttle body connector
3. damaged TPS wiring

What the repair usually costs

• Throttle body clean and idle relearnNZ$90–NZ$190 · A$100–A$200
• Electronic throttle body replaceNZ$470–NZ$1,290 · A$440–A$1,190

Not sure what P0120 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.