Ford
Throttle position sensor range/performance: the throttle position reading does not make sense.
P0121 fault code: what it means
P0121: Throttle position sensor A reading does not match other inputs or moves unevenly.
Usual causes, most likely first
- worn TPS track in the throttle body
- carbon build-up on the throttle plate
- oil-contaminated or corroded TPS connector
P0121 by make
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
- Intake valve carbon clean (walnut blast, direct injection)NZ$530–NZ$1,190 · A$560–A$1,240
Not sure what P0121 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.