When a high idle just after a cold start occurs, first check whether the car remains safe to control. If the engine races unexpectedly or throttle response is stuck, switch off when safe. If the symptom is mild and no critical warning appears, note the conditions and arrange a timely inspection.
The owner’s manual gives the vehicle-specific response for warning lights. Compare behavior with the owner’s manual and check for an intake hose left loose after service. Do not continue a test drive when the car’s behavior becomes unsafe.
Quick educational note
For information, not a diagnosis or repair instruction. Vehicle-specific checks are still required. Consult the manufacturer's guidance and a qualified technician.
How to use this information
This article explains general principles and does not establish what is wrong with your vehicle. Read the content limitations.