Powertrain, generic (extended)

P2242 O2 Sensor Positive Current Control Circuit High (Bank 2 Sensor 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2242 flags the pump-current circuit of the bank 2 front wide-band sensor as too high, usually a short to the heater feed or battery voltage, or a signal locked at its midpoint although the mixture is being changed. No manufacturer publicly documents P2242 with thresholds. Saab describes the bank 1 version P2239 for its 2.0 turbo: 1.48-1.51 V held for 1 s while closed loop enriches the mixture. Ford's 2020-2023 summary routes any short to battery on a wide-band sensor wire to P0152 instead. CARB requires fuel-control sensors to be checked for wiring faults and implausible readings. P2240 is the open circuit, P2241 the low fault, P2239 the same fault on bank 1. Since a voltage short can kill a replacement sensor, the bank 2 harness should be checked first.

Likely causes

Bank 2 pump-current wire shorted to heater supply or battery voltage
Internal short in the bank 2 wide-band sensor
Damaged sensor interface in the ECM

Symptoms

  • Check engine light
  • Bank 2 lambda value stuck near 1.0
  • Replacement sensor fails again if the short remains

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–500
Time0.5–2.5 h

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

Parts involved

oxygen sensor bank2 sensor1oxygen sensor wiringecm

Related codes

P2240P2241P2239P0152

References: law.cornell.edu, saabwisonline.com, fordservicecontent.com.