Drive with caution — fix soon.
This code means the bank 2 knock sensor signal is present but doesn't match what the computer expects, so its readings can't be fully trusted. It's commonly caused by a weak or aging knock sensor, wiring issues, or a sensor that isn't mounted tightly. The usual fix is replacing the knock sensor and checking the wiring and mounting, and it's typically a straightforward repair.
$150 – $400
Varies by vehicle and root cause.
Yes, in most cases you can drive normally for a while. The engine may run slightly more conservatively, but it's safe to get to a shop. Avoid heavy acceleration until it's fixed.
Expect somewhere around $150 to $400. The part is cheap, but labor depends on how easy the sensor is to reach, since on some V-engines it's tucked under the intake.
It's moderate severity. The car won't stop running, but the computer can't rely on that sensor, which can slightly affect timing, power, and economy. It's best to repair it within a reasonable time.
It means the sensor is producing a signal, but the value is off compared to what the computer expects. This often points to a weak sensor or a loose mounting rather than a completely dead sensor.