OBD Guide
ENFRDEESPT

P0037

HO2S Heater Control Circuit Low Bank 1 Sensor 2

P0037 is an OBD-II diagnostic trouble code meaning: HO2S Heater Control Circuit Low Bank 1 Sensor 2. Common causes: break or short circuit in the heater wiring, oxidation or corrosion of oxygen sensor connectors. Estimated repair cost: $6–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–89 (est.)

Symptoms

  • Check Engine Light Illuminates
  • Increased fuel consumption
  • Unstable engine operation at idle
  • Reduced engine power
  • Black smoke from the exhaust pipe
  • Smell of unburned fuel in the exhaust

Causes

  • Break or short circuit in the heater wiring
  • Oxidation or corrosion of oxygen sensor connectors
  • Failure of the sensor heating element
  • Blown heating circuit fuse
  • Engine ECU malfunction
  • Damage to the sensor ground wire
  • Wear of the oxygen sensor itself

How to Fix

  1. Read and record all fault codes using a scanner
  2. Check the oxygen sensor heating circuit fuses
  3. Visually inspect the sensor wiring and connectors for damage.
  4. Measure the resistance of the heating element (should be 2-14 Ohms)
  5. Check the supply voltage at the sensor connector (should be 12V)
  6. Check the sensor ground circuit for an open circuit.
  7. If necessary, replace damaged wiring or connectors
  8. Replace the oxygen sensor if the heater fails
  9. Clear fault codes and test drive

Related codes

P0036P0038P0039P0140P0141P0157P0158

Error P0037 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0037 code mean?

P0037 is an OBD-II diagnostic trouble code that indicates: HO2S Heater Control Circuit Low Bank 1 Sensor 2

What causes a P0037 error code?

The most common causes of P0037 include: Break or short circuit in the heater wiring; Oxidation or corrosion of oxygen sensor connectors; Failure of the sensor heating element; Blown heating circuit fuse.

How do I fix a P0037 diagnostic trouble code?

To fix P0037: Read and record all fault codes using a scanner. Check the oxygen sensor heating circuit fuses. Visually inspect the sensor wiring and connectors for damage.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0037?

Limited driving only, diagnose soon

How much does it cost to fix P0037?

The estimated repair cost for P0037 is $6–89. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat