A flickering check engine light with a rough idle on your Exeed RX usually means an active misfire or fuel/ignition problem.
Here are the likely causes, what to check first, and whether you can keep driving.
Why a flickering check engine light with rough idle matters
On your Exeed RX, a check engine light that flickers or flashes is different from a steady light. It almost always means the engine control module is seeing an active misfire — one or more cylinders are not burning fuel properly. The rough idle is the physical symptom of that misfire. Ignoring it can send unburned fuel into the catalytic converter, where it can overheat and destroy an expensive emissions part.
