P0507 on a BMW: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

Drivable, but the engine idles too fast, which wastes fuel and can make the idle feel uneven.

What P0507 means on a BMW

On a BMW, P0507 means the engine idles higher than the computer expects. Unmetered air is getting in at idle, usually through cracked vacuum or crankcase ventilation hoses. The car still drives, but the high idle wastes fuel and can feel uneven.

Is P0507 common on BMWs?

P0507 is common on BMWs like the 3 Series, 5 Series, X3, and X5, especially as rubber hoses age. The crankcase ventilation hoses and intake boots are known to crack and leak air. A vacuum leak test is usually needed to find the exact spot.

Commonly reported on: 3 Series, 5 Series, X3, X5.

Symptoms

Check engine light is on
High idle speed
Hesitation or surging at idle
Idle stays high when stopped

Common causes

most common: Cracked crankcase ventilation hoses
common: Leaking intake boot or vacuum hose
less common: Sticking idle control valve
less common: Leaking intake manifold gasket

How to fix it

Fix	DIY?	Typical cost
Find and repair vacuum or crankcase hose leaks	Yes	$20–150
Replace cracked intake boots and hoses	Yes	$30–150
Have a smoke test done to find the leak	Mechanic	$50–150