Powertrain, generic (extended)

P2240 O2 Sensor Positive Current Control Circuit/Open (Bank 2 Sensor 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2240 is the open pump-current circuit of the front wide-band sensor on bank 2, so it only exists on V engines and boxers. Ford's summaries (2012 and 2020-2023) introduced it to replace P0154; detection works as on bank 1, by lambda failing to react to reference-current pulses or by the NTK interface chip. VW's 2014 Touareg and CC books flag 1.49-1.51 V combined with a lambda controller offset above 0.07 or a controller at its limit. GM's 2005 V6 adds a fuel cut-off test (signal below 1.7 V for 2 s). FCA reflashes the PCM for P2240 on the 2025 Ram 1500 and Wagoneer with the 3.0 Hurricane (bulletins 18-071-26, 18-082/083-26), and Jaguar Land Rover lists it among the 3.0 V6 sensor faults caused by water shock.

Likely causes

Open pump-current wire or loose pin at the bank 2 sensor connector
Bank 2 front sensor damaged by water or thermal shock
PCM calibration that sets the code without a hardware fault (FCA 2025 Hurricane)

Symptoms

  • Check engine light
  • Bank 2 lambda value stuck at 1.0 in live data
  • Higher fuel consumption

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–450
Time0.3–2.5 h

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

Parts involved

oxygen sensor bank2 sensor1oxygen sensor wiringecm

Related codes

P2237P2241P2242P2247P2254P0154

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