Is high idle dangerous?

Not directly dangerous but it wastes fuel and makes the car lurch forward when put in gear. Fix it for safety.

Can a vacuum leak cause high idle?

Yes — a vacuum leak lets unmetered air in, raising idle speed. The ECM adds fuel but cannot reduce the extra air.

Medium Severity

Engine System

Idle speed is too high. Something is allowing too much air into the engine at idle.

Common Fix

Fix vacuum leak or replace IAC

Estimated Cost (DIY)

$0 - $80

Vacuum leaklikely

Stuck IAC valvepossible

Throttle body sticking openpossible

Intake manifold gasket leakpossible

Need to read or clear this code?

Is high idle dangerous?: Not directly dangerous but it wastes fuel and makes the car lurch forward when put in gear. Fix it for safety.
Can a vacuum leak cause high idle?: Yes — a vacuum leak lets unmetered air in, raising idle speed. The ECM adds fuel but cannot reduce the extra air.

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