P1581 fault code: what it means

P1581: Throttle basic setting (adaptation) not done. Poor idle until the throttle body is re-adapted.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

throttle body adaptation not performed
faulty throttle body

P1581 by make

Audi

Throttle basic setting (adaptation) not done. Poor idle until the throttle body is re-adapted.

Usual causes: throttle body adaptation not performed; faulty throttle body

Honda

IMA motor power inverter (MPI) module current signal problem. Assist and regen may be cut.

Usual causes: motor power inverter module; wiring fault; IMA battery fault

Skoda

Throttle basic setting (adaptation) not done. Poor idle until the throttle body is re-adapted.

Usual causes: throttle body adaptation not performed; faulty throttle body

Volkswagen

Throttle basic setting (adaptation) not done. Poor idle until the throttle body is re-adapted.

Usual causes: throttle body adaptation not performed; faulty throttle body

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
EV battery pack replace (Tesla / Kona / Ioniq / MG / BYD, genuine)NZ$22,110–NZ$47,100 · A$21,240–A$45,230

Not sure what P1581 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.