P0160 O2 Sensor Circuit No Activity Detected Bank 2 Sensor 2

P0160 means no activity was detected from bank 2 sensor 2. The downstream oxygen-sensor signal appears inactive during expected monitor conditions.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not assume the catalyst monitor is valid until the downstream sensor signal and heater circuit are working.

Symptoms of P0160

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0160

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Check downstream bank 2 sensor signal circuit, heater operation, connector condition, and harness damage near the exhaust.
Compare upstream and downstream oxygen-sensor activity after the engine and catalyst are warm.
Inspect for exhaust leaks, sensor contamination, or circuit opens that can make the signal appear flat.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.