P1509 fault code: what it means

P1509: Idle air control valve circuit failure. Idle may be high, low or stall.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

IAC valve
wiring fault

P1509 by make

Honda

Idle air control valve circuit failure. Idle may be high, low or stall.

Usual causes: IAC valve; wiring fault

What the repair usually costs

A/C compressor replace incl. drier and flush (European)NZ$1,560–NZ$3,200 · A$1,490–A$3,050

Not sure what P1509 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.