Powertrain, generic (extended)

P2247 O2 Sensor Reference Voltage Circuit/Open (Bank 2 Sensor 1)

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

P2247 is the bank 2 version of P2243: the Nernst-cell reference line of the upstream wide-band sensor on the second cylinder bank is open. Ford's summaries trip it on Bosch sensors after 10 s outside 0.2-4.7 V and on NTK sensors via the interface chip, replacing the older P0150. VW's 2014 Touareg book names it an open Nernst-voltage circuit with limits of 0.25 and 4.80 V, while GM's 2005 V6 tables call it Type B. Field cases include Honda bulletin 14-002 (2010-11 V6 models, broken sensor tip, usually with P0430), Jaguar Land Rover LTB00671 (2014-16 3.0 supercharged V6, water shock) and a 2025 Ram 1500 3.0 engine software update (FCA 18-071-26). P2243 is bank 1, P2249/P2250 the low/high faults, P2254 the open ground line on bank 2.

Likely causes

Broken reference voltage (Nernst cell) wire or loose pin on the bank 2 sensor

Cracked element or broken sensor tip after thermal shock

Engine software that sets the code falsely (update for some models)

Symptoms

Check engine light
Higher fuel consumption from open-loop fuelling on bank 2
Catalyst efficiency code P0430 if a sensor fragment damaged the converter

Repair estimate

DifficultyMediumDIY possible

Parts and labour€0–450

Time0.3–2 h

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

Parts involved

oxygen sensor bank2 sensor1oxygen sensor wiringecm

References: newtonnet.co.uk, static.nhtsa.gov, gsi.ext.gm.com, static.nhtsa.gov.