PowertrainP0157

Caution

Severity: Caution - get it checked when you can

O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)

39 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 39

Brand	Code	Description	System
Ashok Leyland CV	P0157	Lambda/O2 Sensor Heater (Bank 1, Sensor 1). Short Circuit To Ground Brand	Powertrain
BAIC Motor	P0157	O2 Sensor Circuit Low Voltage Bank 2 Sensor 2 Brand	Powertrain
Mercedes-Benz	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) SAE	Powertrain
BMW	P0157	Intercore short-circuit Brand	Powertrain
BYD	P0157	Oxygen sensor low Brand	Powertrain
Chery	P0157	Oxygen sensor low Brand	Powertrain
Daewoo	P0157	O2 Sensor Circuit Low Voltage Bank 2 Sensor 2 Brand	Powertrain
Daihatsu	P0157	O2 (A/F) sensor system B2S2 Brand	Powertrain
DFFS	P0157	External temperature data failure Brand	Powertrain
DFFX	P0157	Oxygen sensor low Brand	Powertrain
DFXK	P0157	O2 Sensor Circuit Low Voltage Bank 2 Sensor 2 Brand	Powertrain
EOBD	P0157	Syresensorkrets låg spänning bank 2 sensor 2 Brand	Powertrain
Geely	P0157	Oxygen sensor low Brand	Powertrain
GM	P0157	HO2S circuit low voltage bank 2 sensor 2 Brand	Powertrain
Great Wall	P0157	Oxygen sensor low Brand	Powertrain
Hafei	P0157	Oxygen sensor low Brand	Powertrain
Holden	P0157	HO2S Circuit Low Voltage Bank 2 Sensor 2 Brand	Powertrain
Honda	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) SAE	Powertrain
Hyundai	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) SAE	Powertrain
Isuzu	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) SAE	Powertrain
Land Rover	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) SAE	Powertrain
Mahindra	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) SAE	Powertrain
Maserati	P0157	O2 Sensor 2/2 Circuit Low Brand	Powertrain
Mitsubishi	P0157	Oxygen sensor low Brand	Powertrain
Nissan	P0157	Heated oxygen sensor 2 Brand	Powertrain
Opel	P0157	HO2S circuit low voltage bank 2 sensor 2 Brand	Powertrain
Perodua	P0157	O2 (A/F) sensor system B2S2 Brand	Powertrain
Peugeot	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) SAE	Powertrain
Porsche	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) SAE	Powertrain
Proton	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) SAE	Powertrain
Renault	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) SAE	Powertrain
Saab	P0157	HO2S circuit low voltage bank 2 sensor 2 Brand	Powertrain
MG (SAIC)	P0157	Oxygen Sensor Sensor 02 Bank 2 Circuit Low Brand	Powertrain
Sprinter	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) SAE	Powertrain
Subaru	P0157	O2 Sensor Circuit Low Voltage Brand	Powertrain
Suzuki	P0157	O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) Brand	Powertrain
Tata	P0157	O2 Sensor Circuit Low Voltage Bank 2 Sensor 2 Brand	Powertrain
Toyota	P0157	External temperature data failure Brand	Powertrain
Volkswagen	P0157	Oxygen (Lambda) sensor B2 S2: signal too low; 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 2

These 7-character codes are manufacturer-specific variants of P0157 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	P015700	Oxygen sensor 2 (cylinder bank 2) has a short circuit to ground. Brand	Powertrain
SsangYong	P015703	No.4 Oxygen sensor - below the minimum permissible voltage Brand	Powertrain

6Related codes

Browse Pxxx codes or P015xx codes.