Can drive — fix at your convenience.
This code means the engine computer is detecting no activity from the downstream oxygen sensor on bank 2, getting a dead or flat signal instead of normal switching. It's most often caused by a failed rear sensor, but bad wiring, a blown fuse, or a bad connector can also be responsible. The typical fix is replacing the sensor, and it usually doesn't involve major engine repair.
$150 – $350
Varies by vehicle and root cause.
Usually yes. The rear sensor mainly monitors emissions, so the car typically drives normally. Just get it diagnosed before an emissions test, since the warning light won't clear on its own.
Most repairs cost about $150 to $350. The downstream oxygen sensor and labor are the bulk of the cost, while a simple wiring or fuse repair can be cheaper.
It's a low-severity code. It rarely affects how the car runs, but it leaves the check engine light on and can cause an emissions test failure, so it shouldn't be ignored long-term.
It means the rear sensor on bank 2 isn't producing the voltage signal a healthy sensor would. Instead of fluctuating with the exhaust, it's flat or dead, which usually points to a worn-out sensor or a broken circuit.