PowertrainP0056

Caution

Severity: Caution - get it checked when you can

HO2S Heater Control Circuit (Bank 2 Sensor 2)

32 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 and air metering range, which includes fuel-pressure and camshaft-timing 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 promptly. Some codes in this range affect fuel pressure or camshaft timing; if the engine loses power, runs badly, 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 32

Brand	Code	Description	System
Ashok Leyland CV	P0056	Signal CAN. Incorrect Gear Ratio Brand	Powertrain
BAIC Motor	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
Mercedes-Benz	P0056	HO2S Heater Control Circuit (Bank 2 Sensor 2) SAE	Powertrain
BMW	P0056	Open circuit Brand	Powertrain
BYD	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
Chery	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
Daewoo	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
DFFS	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
DFFX	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
DFXK	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
EOBD	P0056	HO2S värmestyrkrets bank 2 sensor 2 Brand	Powertrain
Geely	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
GM	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
Great Wall	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
Hafei	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
Holden	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
Honda	P0056	HO2S Heater Control Circuit (Bank 2 Sensor 2) SAE	Powertrain
Hyundai	P0056	HO2S Heater Control Circuit (Bank 2 Sensor 2) SAE	Powertrain
Isuzu	P0056	HO2S Heater Control Circuit (Bank 2 Sensor 2) SAE	Powertrain
Land Rover	P0056	HO2S Heater Control Circuit (Bank 2 Sensor 2) SAE	Powertrain
Maserati	P0056	O2 Sensor 2/2 Heater Circuit Brand	Powertrain
Mitsubishi	P0056	Oxygen sensor heater2(rear) low Brand	Powertrain
Opel	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
Peugeot	P0056	HO2S Heater Control Circuit (Bank 2 Sensor 2) SAE	Powertrain
Porsche	P0056	HO2S Heater Control Circuit (Bank 2 Sensor 2) SAE	Powertrain
Proton	P0056	Oxygen sensor heater2(rear) low Brand	Powertrain
Saab	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
MG (SAIC)	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
Suzuki	P0056	HO2S Heater Control Circuit (Bank 2 Sensor 2) Brand	Powertrain
Tata	P0056	HO2S Heater Control Circuit Bank 2 Sensor 2 Brand	Powertrain
Toyota	P0056	Exchanger flow control solenoid valve output failure Brand	Powertrain
Volkswagen	P0056	Oxygen (Lambda) sensor B2 S2: heating circuit: malfunction / open circuit; Cannot be tested at this time 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.

5Related codes

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