P0165 O2 Sensor Circuit Slow Response Bank 2 Sensor 3

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.

Likely causes

Symptoms

• Check engine light on (usually after two drive cycles)
• Catalyst readiness incomplete
• Usually no noticeable change in driving

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, saabwisonline.com, newtonnet.co.uk.