A flickering check engine light with a rough idle usually points to a misfire or vacuum leak. Here’s what to check first and whether you can keep driving.
What a Flickering Light and Rough Idle Mean
When your Sequoia III’s check engine light flickers instead of staying steady, that’s your engine computer telling you it’s detecting a misfire that’s bad enough to damage the catalytic converter. A rough idle almost always accompanies this — you’ll feel it as shaking or vibration when stopped at a light. The most common culprits on this generation are ignition coils, spark plugs, or a vacuum leak that throws off the air-fuel mixture.
