Powertrain, generic (extended)

P22AE O2 Sensor Reference Voltage Circuit/Open (Bank 1 Sensor 2)

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

P22AE points to an open reference voltage line of the bank 1 downstream wide-band probe, i.e. the lead of the Nernst (sensing) cell, called RE/UN by Bosch and VS by NTK. Through it the controller reads the cell voltage it regulates the pump current against, so a break leaves the oxygen value meaningless. Chrysler lists P22AE for 2010-2012 Ram 2500/3500 with the 6.7 Cummins; bulletin 25-003-13 found tin instead of gold terminals in five cavities of the 2011 sensor-module connector. For the upstream twin P2243, Ford, GM and Saab declare an open when the sensor voltage leaves 0.2-4.7 V and, at GM/Saab, the cell resistance exceeds 570 ohms. P22AF, P22B0 and P22B1 are performance/low/high, P22BB is bank 2. The lamp comes on.

Likely causes

Corroded or wrongly plated terminals in the sensor or sensor-module connector

Broken Nernst-cell wire in the harness

Cracked or aged sensing cell with very high internal resistance

Symptoms

Check engine light
Downstream oxygen or lambda value invalid in live data
Other downstream sensor codes may be stored at the same time

Repair estimate

DifficultyMediumDIY possible

Parts and labour€0–450

Time0.5–2.5 h

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

Parts involved

oxygen sensor bank1 sensor2oxygen sensor wiringecm

References: static.nhtsa.gov, static.nhtsa.gov, newtonnet.co.uk, saabwisonline.com.