Fault code lookup

PowertrainP0138

Caution

Severity: Caution - get it checked when you can

O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)

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 after the catalytic converter is reporting a voltage that is too high.

2Common causes

  1. Faulty oxygen sensor
  2. Rich fuel mixture
  3. Exhaust leak near the sensor
  4. Damaged wiring or connector
  5. Catalytic converter damage

3Can I drive?

Caution · drive with care

Usually safe to drive. Fuel economy may suffer; have it checked before an inspection.

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 CVP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
BAIC MotorP0138Rear O2 Sensor Short High BrandPowertrain
Mercedes-BenzP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
BMWP0138Short circuit to positive BrandPowertrain
BYDP0138Oxygen sensor high BrandPowertrain
CheryP0138Oxygen sensor high BrandPowertrain
ChryslerP0138Oxygen sensor 2/2 circuit low BrandPowertrain
DaewooP0138O2 sensor 2 rich exhaust BrandPowertrain
DaihatsuP0138O2 sensor short BrandPowertrain
DFFSP0138Downstream oxygen sensor signal failure BrandPowertrain
DFFXP0138Oxygen sensor high BrandPowertrain
DFXKP0138Downstream sensor circuit high BrandPowertrain
EOBDP0138O2-sensorcircuit hoge spanning bank 1 sensor 2 BrandPowertrain
FordP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
GeelyP0138Oxygen sensor high BrandPowertrain
GMP0138HO2S circuit high voltage bank 1 sensor 2 BrandPowertrain
Great WallP0138Oxygen sensor high BrandPowertrain
HafeiP0138Oxygen sensor high BrandPowertrain
HoldenP0138HO2S Circuit High Voltage Sensor 2 BrandPowertrain
HondaP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
HyundaiP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
IsuzuP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
Land RoverP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
MahindraP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
MaseratiP0138Oxygen sensor circuit high (bank 1 sensor 2) BrandPowertrain
MazdaP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
MitsubishiP0138Oxygen sensor high BrandPowertrain
NissanP0138Heated oxygen sensor 2 BrandPowertrain
OpelP0138HO2S circuit high voltage bank 1 sensor 2 BrandPowertrain
PeroduaP0138O2 sensor short BrandPowertrain
PeugeotP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
PorscheP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
ProtonP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
RenaultP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
SaabP0138HO2S circuit high voltage bank 1 sensor 2 BrandPowertrain
MG (SAIC)P0138O2 Sensor Circ.,Bank1-Sensor2 High Voltage BrandPowertrain
SmartP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
SprinterP0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) SAEPowertrain
SubaruP0138O2 Sensor Circuit High Voltage BrandPowertrain
SuzukiP0138O2 Sensor (HO2S) Circuit High Voltage (Sensor2) BrandPowertrain
SWM MotorP0138rear oxygen sensor voltage high BrandPowertrain
TataP0138Oxygen Sensor 2 BrandPowertrain
ToyotaP0138Downstream oxygen sensor short to high voltage BrandPowertrain
VolkswagenP0138Oxygen (Lambda) sensor B1 S2: signal too high; Short to ground 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 3

These 7-character codes are manufacturer-specific variants of P0138 and may be reported by some scan tools.

BrandCodeDescriptionSystem
Mercedes-BenzP013800Die Lambdasonde 2 (Zylinderreihe 1) hat Kurzschluss nach Plus. BrandPowertrain
SsangYongP013800O2 sensor circuit high voltage (bank 1 / sensor 2) BrandPowertrain
Mercedes-BenzP013812Die Lambdasonde 2 (Zylinderreihe 1) hat Kurzschluss nach Plus. Es liegt ein Kurzschluss nach Plus vor. BrandPowertrain

6Related codes

  • P0130 O2 Sensor Circuit (Bank 1 Sensor 1)
  • P0131 O2 Sensor Circuit Low Voltage (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)
  • 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)

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