Can drive — fix at your convenience.
This code means the downstream oxygen sensor on bank 2 is reporting a continuously low voltage, which can point to a lean exhaust condition, a failing sensor, or a wiring fault. Because this sensor mainly tracks catalytic converter performance, the impact on how the car drives is usually small. It's commonly resolved by replacing the sensor or repairing its wiring, sometimes after fixing an exhaust leak.
$150 – $350
Varies by vehicle and root cause.
Usually yes. The rear sensor mainly monitors emissions, so the car typically drives fine. Get it diagnosed soon and before any emissions test, since the check engine light won't turn off on its own.
Most repairs cost about $150 to $350. The downstream oxygen sensor and labor make up most of the bill, and a wiring or exhaust leak repair may be less.
It's generally low-severity. It rarely affects drivability, but it should still be fixed because it keeps the warning light on and can cause you to fail emissions testing.
Oxygen sensors produce a small voltage that swings up and down as exhaust changes. A steady low reading suggests the sensor sees a lean exhaust or has an internal or wiring fault, which is why it gets flagged.