Flickering Check Engine Light and Rough Idle on Range Rover V

What the flicker is telling you

A check engine light that flickers rather than staying on is often the ECU reporting an active misfire. On a Range Rover V, that can come from a tired spark plug or ignition coil on petrol models, a leaking intake or PCV hose, weak fuel delivery, or an injector that is not spraying cleanly. Diesel versions more often point toward injector balance, EGR/intake clogging, or air-metering faults. Rough idle is the clue that the fault is present at low engine speed, so do not dismiss it as a loose fuel cap.

Check these first

Start with a proper scan tool reading stored, pending, and freeze-frame codes, plus per-cylinder misfire counters if available. Then inspect the basics before throwing parts at it:

• Spark plugs and ignition coils on petrol models, especially if the misfire follows one cylinder.
• Intake and vacuum leaks including intake boots, PCV hoses, and the oil separator.
• MAF/MAP sensor and throttle body for contamination or implausible readings.
• Fuel pressure and injectors if the misfire is random or worse when cold.
• Battery voltage and engine grounds because low voltage can make a Range Rover idle poorly and set misleading codes.

Can you keep driving?

If the light only flickers briefly and the car otherwise drives normally, you can usually drive gently to a garage for diagnosis, but avoid hard acceleration, towing, and long trips. If it flashes continuously, the engine shakes heavily, power drops, or you smell raw fuel, stop driving and arrange recovery. An active misfire can overheat the catalytic converter and turn a manageable repair into an expensive one.

This material is AI-generated and for informational purposes only — it does not replace an in-person diagnosis by a qualified mechanic.