Drivable short-term, but fix now to avoid damage.
This code means the engine computer found that cylinder 9 is contributing too little or too much power compared to the other cylinders, throwing off the engine's balance. It usually points to a clogged or weak fuel injector, low compression, a vacuum leak, or an ignition problem on that cylinder. Fixing it typically involves cleaning or replacing the injector and checking the cylinder's compression and spark.
$150 – $700
Varies by vehicle and root cause.
Short trips are usually fine, but don't let it go. An imbalanced cylinder makes the engine run rough and can damage the catalytic converter over time, so get it checked soon.
Repairs typically range from $150 to $700. Cleaning or replacing an injector is at the lower end, while compression-related fixes or ignition work can push the cost higher.
Yes, it's fairly serious because it means a cylinder isn't working properly. The car may still drive, but the rough running and potential converter damage make it worth fixing promptly.
Not always. It can also come from low compression, a vacuum leak, or an ignition issue on cylinder 9, so a technician will usually run a compression and balance test to find the real cause.