Drive with caution — fix soon.
This code means the downstream oxygen sensor on bank 2 is switching between rich and lean too slowly, so the computer can't reliably evaluate the catalytic converter. It's most often caused by an aging or contaminated rear sensor, though wiring problems or an exhaust leak can contribute. The usual fix is replacing the sensor, and it rarely requires major engine work.
$150 – $350
Varies by vehicle and root cause.
Usually yes, for a short time. The car typically drives normally since this is the rear emissions-monitoring sensor. Have it checked within a week or two and before any emissions test.
Most repairs run $150 to $350. The downstream oxygen sensor and labor are the main costs, while a wiring or exhaust fix can be on the lower end.
It's a moderate concern. It usually doesn't affect drivability, but the slow sensor makes it harder to monitor the catalytic converter and will cause an emissions test failure if ignored.
Both involve the bank 2 sensor 2 circuit. P0159 flags a slow-responding sensor, while P0160 indicates the sensor shows no activity at all. They often point to the same sensor wearing out, just at different stages.