Can drive — fix at your convenience.
This code means the engine computer detected an unusually high voltage signal from the third oxygen sensor on bank 1, which monitors exhaust after the catalytic converter. It usually points to a failing O2 sensor, a wiring or connector problem, or rarely an exhaust leak affecting the reading. It's a common, sensor-related code that's typically fixable without major engine work.
$150 – $400
Varies by vehicle and root cause.
For everyday driving, usually yes. This is an emissions sensor code, so the car should still run and won't leave you stranded. Just don't put it off for weeks, since it can hurt fuel economy and emissions over time.
Most repairs run between $150 and $400, with the oxygen sensor itself being the main cost. If it turns out to be a wiring or connector issue, it can be cheaper, but hard-to-reach sensors raise labor.
It's generally a low-severity code. It won't damage your engine in the short term, but leaving it unfixed can mean worse mileage and a failed emissions test, so it's worth addressing soon.
Bank 1 Sensor 3 is an oxygen sensor mounted in the exhaust after the catalytic converter on the engine's bank 1 side. It checks how well the converter is cleaning exhaust, so a high-voltage signal here usually points to that specific sensor or its wiring.