Drive with caution — fix soon.
This code means the front oxygen sensor on bank 2 is reporting a persistently high voltage, which the computer reads as a constantly rich exhaust. It can be caused by a failing O2 sensor, a wiring short to power, or an actual rich-running condition from fuel system issues. It's a fairly common code and is usually fixable once the cause of the high reading is pinpointed.
$150 – $500
Varies by vehicle and root cause.
For short trips, usually yes, but you shouldn't lean on it. Because this upstream sensor helps control fuel, a lasting rich condition can foul plugs and stress the catalytic converter, so get it checked soon.
Most repairs run $150 to $500. A simple oxygen sensor replacement is at the low end, while diagnosing and fixing a fuel injector or pressure problem can raise the total.
It's a moderate-severity code. It usually won't strand you, but a prolonged rich condition wastes fuel and can damage the catalytic converter over time, so it's worth addressing promptly.
An oxygen sensor produces higher voltage when it senses little oxygen in the exhaust, which happens when the mixture is rich with fuel. A steadily high reading therefore often points to too much fuel, though a faulty sensor or wiring short can mimic it.