PowertrainP2270

Caution

Severity: Caution - get it checked when you can

O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2)

38 brands affected · Generic SAE J2012 description.

Key terms: Control module: a small computer that runs one part of the car · Bank 1: the side of the engine containing cylinder 1 · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions

1What it means in plain English

The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.

2Common causes

Sensor or actuator fault
Wiring or connector fault
Vacuum or intake leak
Fuel or ignition problem
Control module fault

3Can I drive?

Caution · drive with care

Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 38

Brand	Code	Description	System
Ashok Leyland CV	P2270	EGR (Exhaust Gas Recirculation) Temperature Sensor. Sensor A Brand	Powertrain
BAIC Motor	P2270	O2 Sensor Signal Stuck Lean Brand	Powertrain
Mercedes-Benz	P2270	O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2) SAE	Powertrain
BMW	P2270	Rich-mixture voltage not reached Brand	Powertrain
BYD	P2270	O2 sensor signal stuck rich Brand	Powertrain
Chery	P2270	Downstream oxygen sensor Aging Brand	Powertrain
Daewoo	P2270	O2 Sensor Signal Stuck Lean Bank 1 Sensor 2 Brand	Powertrain
DFFS	P2270	Downstream oxygen sensor signal failure Brand	Powertrain
DFFX	P2270	Downstream oxygen sensor aging Brand	Powertrain
DFXK	P2270	O2 Sensor Signal Stuck Lean Brand	Powertrain
EOBD	P2270	Oksygenfølersignal skjev/fast mager bank 1 sensor 2 Brand	Powertrain
Ford	P2270	O2 Circuit (Bank 1, Sensor 2) Brand	Powertrain
Geely	P2270	Downstream O2 Sensor Aging Brand	Powertrain
GM	P2270	O2 Sensor Signal Stuck Lean Bank 1 Sensor 2 Brand	Powertrain
Great Wall	P2270	O2 Sensor Signal Stuck Lean Bank 1 Sensor 2 Brand	Powertrain
Hafei	P2270	O2 Sensor Signal Stuck Lean Bank 1 Sensor 2 Brand	Powertrain
Holden	P2270	HO2S Signal Stuck Lean Sensor 2 Brand	Powertrain
Honda	P2270	O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2) SAE	Powertrain
Hyundai	P2270	O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2) SAE	Powertrain
Isuzu	P2270	O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2) SAE	Powertrain
Land Rover	P2270	Oxygen sensor 1-2 - Signal stuck lean Brand	Powertrain
Maserati	P2270	Oxygen sensor signal biased lean (bank 1 sensor 2) Brand	Powertrain
Mitsubishi	P2270	O2S(rear) signal stuck lean Brand	Powertrain
Opel	P2270	O2 Sensor Signal Stuck Lean Bank 1 Sensor 2 Brand	Powertrain
Peugeot	P2270	O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2) SAE	Powertrain
Porsche	P2270	O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2) SAE	Powertrain
Proton	P2270	O2S(rear) signal stuck lean Brand	Powertrain
Saab	P2270	O2 Sensor Signal Stuck Lean Bank 1 Sensor 2 Brand	Powertrain
MG (SAIC)	P2270	O2 Sensor Signal Stuck Lean Bank 1 Sensor 2 Brand	Powertrain
Smart	P2270	O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2) SAE	Powertrain
Sprinter	P2270	O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2) SAE	Powertrain
Subaru	P2270	spark knocking at high air intake temperature Brand	Powertrain
Suzuki	P2270	O2 Sensor Signal Biased / Stuck Lean (Bank1 Sensor2) Brand	Powertrain
SWM Motor	P2270	Downstream oxygen sensor aging Brand	Powertrain
Tata	P2270	O2 Sensor Signal Stuck Lean Bank 1 Sensor 2 Brand	Powertrain
Toyota	P2270	Downstream oxygen sensor too lean during acceleration enrichment Brand	Powertrain
Volvo	P2270	Lack Of HO2S12 Switches - Sensor Indicates Lean Brand	Powertrain
Volkswagen	P2270	Oxygen (Lambda) sensor signal B1 S2: too Lean; Short to plus Brand	Powertrain

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Extended variant codes 3

These 7-character codes are manufacturer-specific variants of P2270 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	P227000	Das Signal der Lambdasonde 2 (Zylinderreihe 1) ist in Richtung 'Mager' verschoben. Brand	Powertrain
Hyundai	P227000	If the rear lambda sensor signal is stuck lean under engine over-run condition, ECM sets Brand	Powertrain
SsangYong	P227000	Downstream oxygen sensor signal error (air/fuel ratio signal stuck rich) Brand	Powertrain

6Related codes

Browse Pxxx codes or P227xx codes.