Fault code lookup

PowertrainP0131

Caution

Severity: Caution - get it checked when you can

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

44 brands affected · Generic SAE J2012 description.

Key terms: Catalytic converter: cleans the exhaust gases · Oxygen sensor: measures oxygen in the exhaust gas · 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 oxygen sensor before the catalytic converter is reporting a voltage that is too low, which usually means a lean mixture or a tired sensor.

2Common causes

  1. Faulty oxygen sensor
  2. Vacuum or intake air leak
  3. Weak fuel pressure
  4. Exhaust leak before the sensor
  5. Damaged wiring or connector

3Can I drive?

Caution · drive with care

Usually safe to drive gently. If the engine hesitates or surges, have it checked soon.

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 44

BrandCodeDescriptionSystem
Ashok Leyland CVP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
BAIC MotorP0131O2 11 ShortLow BrandPowertrain
Mercedes-BenzP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
BMWP0131Short circuit to negative BrandPowertrain
BYDP0131Oxygen sensor low BrandPowertrain
CheryP0131Oxygen sensor low BrandPowertrain
ChryslerP0131Oxygen sensor 1/1 circuit low BrandPowertrain
DaewooP0131O2 Sensor 1 Circuit Voltage Low BrandPowertrain
DaihatsuP0131O2 (A/F) sensor system B1S1 BrandPowertrain
DFFSP0131Upstream oxygen sensor signal failure BrandPowertrain
DFFXP0131Oxygen sensor low BrandPowertrain
DFXKP0131Upstream sensor circuit low BrandPowertrain
EOBDP0131O2-sensorcircuit lage spanning bank 1 sensor 1 BrandPowertrain
FordP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
GeelyP0131Oxygen sensor low BrandPowertrain
GMP0131HO2S circuit low voltage bank 1 sensor 1 BrandPowertrain
Great WallP0131Oxygen sensor low BrandPowertrain
HafeiP0131Oxygen sensor low BrandPowertrain
HoldenP0131HO2S Circuit Low Voltage Sensor 1 BrandPowertrain
HondaP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
HyundaiP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
IsuzuP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
Land RoverP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
MahindraP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
MaseratiP0131Oxygen sensor circuit low (bank 1 sensor 1) BrandPowertrain
MazdaP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
MitsubishiP0131O2S/LAFS(front) low BrandPowertrain
NissanP0131Heated oxygen sensor 1 BrandPowertrain
OpelP0131HO2S circuit low voltage bank 1 sensor 1 BrandPowertrain
PeroduaP0131O2 (A/F) sensor system B1S1 BrandPowertrain
PeugeotP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
PorscheP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
ProtonP0131O2S/LAFS(front) low BrandPowertrain
RenaultP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
SaabP0131HO2S circuit low voltage bank 1 sensor 1 BrandPowertrain
MG (SAIC)P0131O2 Sensor Circ.,Bank1-Sensor1 Low Voltage BrandPowertrain
SmartP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
SprinterP0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) SAEPowertrain
SubaruP0131O2 Sensor Circuit Low Voltage BrandPowertrain
SuzukiP0131O2 Sensor (HO2S) Circuit Low Voltage (Bank1 Sensor1) BrandPowertrain
SWM MotorP0131Front oxygen sensor short to low voltage BrandPowertrain
TataP0131Upstream O2 Sensor Fault BrandPowertrain
ToyotaP0131Upstream oxygen sensor short to low voltage BrandPowertrain
VolkswagenP0131Oxygen (Lambda) sensor B1 S1: signal too low BrandPowertrain

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 P0131 and may be reported by some scan tools.

BrandCodeDescriptionSystem
SsangYongP013100No.1 Oxygen sensor - below the minimum permissible voltage BrandPowertrain

6Related codes

  • P0130 O2 Sensor Circuit (Bank 1 Sensor 1)
  • P0132 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
  • P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
  • P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
  • P0135 O2 Sensor Heater Circuit (Bank 1 Sensor 1)
  • P0136 O2 Sensor Circuit (Bank 1 Sensor 2)
  • P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
  • P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
  • P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
  • P013A O2 Sensor Slow Response - Rich to Lean (Bank 1 Sensor 2)
  • P013B O2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 2
  • P013C O2 Sensor Slow Response - Rich to Lean (Bank 2 Sensor 2)

Browse Pxxx codes or P013xx codes.

OpenDTC - independent fault code reference