DTC P2270-19: A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 Circuit Current Above Threshold; DTC P2271-18: A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 Circuit Current Below Threshold [08/2020 - ]: Description

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Refer to DTC P0036-12.

Refer to DTC P0036-12: HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery; DTC P0036-13: A/F (O2) Heater Control Circuit Bank 1 Sensor 2 Circuit Open; DTC P102A-9E: O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On [08/2020 - ]

HINT:

Although the DTC title say O2 sensor, these DTCs relate to the air fuel ratio sensor (sensor 2).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P2270-19	A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 Circuit Current Above Threshold	While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor (sensor 2) current is 33.13 mA or more for 0.5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 2) circuit Air fuel ratio sensor (sensor 2) Intake system Gas leak from exhaust system Fuel pressure (for high pressure side) Fuel pressure (for low pressure side) Port fuel injector assembly Direct fuel injector assembly Fuel system EGR valve assembly ECM	Comes on	DTC stored	SAE Code: P2270 DTC for Mexico Models: Does not apply
P2271-18	A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 Circuit Current Below Threshold	While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor (sensor 2) current is less than 7.5 mA for 0.5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 2) circuit Air fuel ratio sensor (sensor 2) Intake system Gas leak from exhaust system Fuel pressure (for high pressure side) Fuel pressure (for low pressure side) Port fuel injector assembly Direct fuel injector assembly Fuel system EGR valve assembly ECM	Comes on	DTC stored	SAE Code: P2271 DTC for Mexico Models: Applies

HINT:

When any of these DTCs are stored, check the air fuel ratio sensor (sensor 2) current output by entering the following menus on the Techstream: Powertrain / Engine / Data List / A/F (O2) Sensor Current B1S2.
Short-term fuel trim values can also be read using the Techstream.
If an air fuel ratio sensor (sensor 2) malfunction is detected, the ECM will store a DTC.