OBD Guide
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P0031

HO2S Heater Control Circuit Low (Bank 1 Sensor 1)

P0031 is an OBD-II diagnostic trouble code meaning: HO2S Heater Control Circuit Low (Bank 1 Sensor 1). Common causes: open or short circuit in the heating circuit wiring, oxygen sensor malfunction. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • Increased fuel consumption
  • Rough engine idle
  • Loss of engine power
  • Increased exhaust toxicity
  • Check Engine Light Illuminates
  • Difficulty starting a cold engine

Causes

  • Open or short circuit in the heating circuit wiring
  • Oxygen sensor malfunction
  • Oxidation or corrosion of connectors
  • Malfunction of the oxygen sensor heating relay
  • Damage to the heating circuit fuse
  • Engine control unit (ECU) malfunction

How to Fix

  1. Read error codes and analyze data from the diagnostic scanner
  2. Check the fuses and relays of the oxygen sensor heating circuit.
  3. Inspect the wiring for damage, breaks and corrosion
  4. Measure the resistance of the sensor heating element (should be 2-14 Ohms)
  5. Check the supply voltage at the sensor connector with the engine running
  6. If necessary, replace the oxygen sensor
  7. Clean connectors and repair damaged wiring
  8. Clear error codes and take a test drive

Related codes

P0030P0032P0037P0038P0133P0135

Error P0031 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0031 code mean?

P0031 is an OBD-II diagnostic trouble code that indicates: HO2S Heater Control Circuit Low (Bank 1 Sensor 1)

What causes a P0031 error code?

The most common causes of P0031 include: Open or short circuit in the heating circuit wiring; Oxygen sensor malfunction; Oxidation or corrosion of connectors; Malfunction of the oxygen sensor heating relay.

How do I fix a P0031 diagnostic trouble code?

To fix P0031: Read error codes and analyze data from the diagnostic scanner. Check the fuses and relays of the oxygen sensor heating circuit.. Inspect the wiring for damage, breaks and corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0031?

Limited driving only, diagnose soon

How much does it cost to fix P0031?

The estimated repair cost for P0031 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat