Drive with caution — fix soon.
This code is set when the voltage signal from the bank 2 sensor 3 oxygen sensor stays too low, which can indicate the sensor reads a constant lean exhaust or that there's a short or open in the circuit. This rear sensor helps monitor emissions and catalytic converter efficiency. It's commonly fixed by replacing the oxygen sensor, though wiring shorts, bad connectors, or a true lean fuel condition should be ruled out first.
$150 – $400
Varies by vehicle and root cause.
In most cases yes, at least for short trips, since this sensor mainly affects emissions monitoring. If you also notice rough idling or hesitation, a lean condition could be involved and you should get it looked at sooner. Otherwise, plan a diagnosis within a week or two.
Typical repairs run $150 to $400, mostly for the oxygen sensor and about an hour of labor. If the cause is a wiring short or an air leak rather than the sensor, the price can vary. Diagnosis time is well spent here to avoid replacing a good sensor.
It's usually a moderate concern. The car stays drivable, but if a genuine lean condition is behind the low voltage, it's worth addressing before it affects performance or the catalytic converter. At minimum it will keep you from passing an emissions test.
It can, but not always. A low oxygen sensor voltage often reflects a lean exhaust, yet the same reading can also come from a shorted wire or a failing sensor. That's why a technician checks fuel trims and wiring before deciding whether the sensor or the fuel mixture is the real problem.