PowertrainP0156

Caution

Severity: Caution - get it checked when you can

O2 Sensor Circuit (Bank 2 Sensor 2)

41 brands affected · Generic SAE J2012 description.

Key terms: Oxygen sensor: measures oxygen in the exhaust gas · Mass air flow sensor: measures the air going into the engine · Bank 2: the side of the engine containing cylinder 2 · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions

1What it means in plain English

This code is in the fuel, air and oxygen sensor range, which also includes coolant temperature faults.

2Common causes

Dirty or faulty mass air flow sensor
Vacuum or intake air leak
Weak fuel pump or clogged fuel filter
Faulty fuel injector
Faulty oxygen sensor
Wiring or connector fault

3Can I drive?

Caution · drive with care

Have it diagnosed if the engine runs badly or the code keeps returning. Because this range includes coolant temperature sensors, watch the temperature gauge: if it climbs into the red, or the engine overheats or stalls, stop safely and get professional help.

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 41

Brand	Code	Description	System
Ashok Leyland CV	P0156	O2 Sensor Circuit (Bank 2 Sensor 2) SAE	Powertrain
BAIC Motor	P0156	O2 Sensor Circuit Bank 2 Sensor 2 Brand	Powertrain
Mercedes-Benz	P0156	O2 Sensor Circuit (Bank 2 Sensor 2) SAE	Powertrain
BMW	P0156	Heater coupling to signal Brand	Powertrain
BYD	P0156	Oxygen sensor Brand	Powertrain
Chery	P0156	Oxygen sensor Brand	Powertrain
Chrysler	P0156	Oxygen sensor after catalytic converter bank 3/electrical test Brand	Powertrain
Daewoo	P0156	O2 Sensor Circuit Bank 2 Sensor 2 Brand	Powertrain
Daihatsu	P0156	O2 sensor system B2S2 Brand	Powertrain
DFFS	P0156	O2 Sensor Circuit Bank 2 Sensor 2 Brand	Powertrain
DFFX	P0156	Oxygen sensor Brand	Powertrain
DFXK	P0156	O2 Sensor Circuit Bank 2 Sensor 2 Brand	Powertrain
EOBD	P0156	Syresensorkrets bank 2 sensor 2 Brand	Powertrain
Ford	P0156	DTC(Diagnostic Trouble Codes) P0136 and Brand	Powertrain
Geely	P0156	Oxygen sensor Brand	Powertrain
GM	P0156	Sensor 2, banco 2 Brand	Powertrain
Great Wall	P0156	Oxygen sensor Brand	Powertrain
Hafei	P0156	Oxygen sensor Brand	Powertrain
Holden	P0156	HO2S Circuit Bank 2 Sensor 2 Brand	Powertrain
Honda	P0156	O2 Sensor Circuit (Bank 2 Sensor 2) SAE	Powertrain
Hyundai	P0156	O2 Sensor Circuit (Bank 2 Sensor 2) SAE	Powertrain
Isuzu	P0156	O2 Sensor Circuit (Bank 2 Sensor 2) SAE	Powertrain
Land Rover	P0156	O2 Sensor Circuit (Bank 2 Sensor 2) SAE	Powertrain
Maserati	P0156	O2 Sensor 2/2 Circuit Brand	Powertrain
Mazda	P0156	DTC(Diagnostic Trouble Codes) P0136 and Brand	Powertrain
Mitsubishi	P0156	Oxygen sensor Brand	Powertrain
Nissan	P0156	Heated oxygen sensor 2 Brand	Powertrain
Opel	P0156	Sensor 2, banco 2 Brand	Powertrain
Perodua	P0156	O2 sensor system B2S2 Brand	Powertrain
Peugeot	P0156	O2 Sensor Circuit (Bank 2 Sensor 2) SAE	Powertrain
Porsche	P0156	Lambdasondenalterung nach Kat. Bank 2 Brand	Powertrain
Proton	P0156	Oxygen sensor Brand	Powertrain
Saab	P0156	Sensor 2, banco 2 Brand	Powertrain
MG (SAIC)	P0156	O2 Sensor Circuit Bank 2 Sensor 2 Brand	Powertrain
Smart	P0156	O2 Sensor Circuit (Bank 2 Sensor 2) SAE	Powertrain
Sprinter	P0156	O2 Sensor Circuit (Bank 2 Sensor 2) SAE	Powertrain
Subaru	P0156	O2 Sensor Circuit Brand	Powertrain
Suzuki	P0156	O2 Sensor Circuit Malfunction (Bank2 Sensor2) Brand	Powertrain
Tata	P0156	O2 Sensor Circuit Bank 2 Sensor 2 Brand	Powertrain
Toyota	P0156	Heated oxygen sensor 2 fault (bank 2) Brand	Powertrain
Volkswagen	P0156	Oxygen (Lambda) sensor B2 S2: malfunction in circuit; Defective 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 1

These 7-character codes are manufacturer-specific variants of P0156 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	P015600	Oxygen sensor 2 (cylinder bank 2) has an electrical fault. Brand	Powertrain

6Related codes

Browse Pxxx codes or P015xx codes.