Can drive — fix at your convenience.
This code means the heater circuit inside the downstream oxygen sensor on bank 2 isn't working correctly, so the sensor takes too long to reach operating temperature. This sensor mainly watches the catalytic converter's performance, so the impact on daily driving is small. The usual fix is replacing the sensor, though sometimes it's a wiring, fuse, or relay problem instead.
$150 – $350
Varies by vehicle and root cause.
Yes, in most cases the car drives normally. The downstream sensor mainly monitors the catalytic converter, so day-to-day driving isn't usually affected. Just get it repaired before an emissions test.
Typically $150 to $350. The downstream oxygen sensor plus labor is the main cost, and a simple fuse or wiring repair would be on the lower end.
It's generally a low-severity issue. It rarely affects how the car runs, but it will keep the check engine light on and can cause you to fail an emissions inspection.
The heater warms the sensor quickly so it can start reading accurately soon after startup. Without it, the sensor takes longer to work, which delays proper emissions monitoring on bank 2's rear sensor.