P0165O2 Sensor Circuit Slow Response Bank 2 Sensor 3
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Sensor 3 on bank 2 is a switching oxygen sensor behind a second converter or converter brick. It is rare – documented for Jaguar Land Rover's supercharged V6 and V8 (2013–2016), where it is the 'post-cat' sensor of the second bank, and for Ford systems that monitor part of the converter volume. P0165 means sensor 3 reacts too slowly to mixture changes, typically measured around fuel cut-off as for the downstream sensor 2 (Subaru limits for P0139: 0.51 s rich to lean, 2 s lean to rich). No manufacturer document using exactly this code was found – the Jaguar Land Rover bulletins list only P0162–P0164 and P0167 for this sensor. The description rests on CARB's response requirement for downstream sensors and the sensor 2 logic. When it fails, the downstream evaluation of that converter is suspended; there is no limp mode.
- What you may notice
- Check engine light on (usually after two drive cycles)
- Catalyst readiness incomplete
- Usually no noticeable change in driving
- Likely causes
- LikelySensor aged or contaminated
- PossibleSensor heater weak
- PossibleExhaust leak ahead of the sensor
- RareWiring or connector high-resistance
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €60 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.