OBD Guide
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P0044

HO2S Heater Control Circuit High Bank 1 Sensor 3

P0044 is an OBD-II diagnostic trouble code meaning: HO2S Heater Control Circuit High Bank 1 Sensor 3. Common causes: faulty oxygen sensor (lambda probe), short circuit in the sensor heater wiring. Estimated repair cost: $11–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–89 (est.)

Symptoms

  • Check Engine Light Illuminates
  • Increased fuel consumption
  • Unstable engine idling
  • Reduced engine power
  • Rough engine operation when warming up
  • Increased exhaust toxicity

Causes

  • Faulty oxygen sensor (lambda probe)
  • Short circuit in the sensor heater wiring
  • Damaged or corroded sensor connectors
  • Faulty oxygen sensor heater relay
  • Problems in the heater power circuit
  • Engine ECU malfunction
  • Break in the ground wire of the sensor

How to Fix

  1. Connect a diagnostic scanner and check all error codes
  2. Check the operation of the oxygen sensor using a multimeter
  3. Measure the resistance of the sensor heater (should be 2-14 Ohms)
  4. Check the supply voltage in the sensor connector (should be about 12V)
  5. Inspect wiring and connectors for damage and corrosion
  6. Check oxygen sensor heater relay
  7. If necessary, replace the faulty oxygen sensor
  8. Repair or replace damaged wiring
  9. Clear error memory and test drive

Related codes

P0030P0031P0032P0036P0037P0038P0042P0043P0059

Error P0044 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0044 code mean?

P0044 is an OBD-II diagnostic trouble code that indicates: HO2S Heater Control Circuit High Bank 1 Sensor 3

What causes a P0044 error code?

The most common causes of P0044 include: Faulty oxygen sensor (lambda probe); Short circuit in the sensor heater wiring; Damaged or corroded sensor connectors; Faulty oxygen sensor heater relay.

How do I fix a P0044 diagnostic trouble code?

To fix P0044: Connect a diagnostic scanner and check all error codes. Check the operation of the oxygen sensor using a multimeter. Measure the resistance of the sensor heater (should be 2-14 Ohms). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0044?

Limited driving only, diagnose soon

How much does it cost to fix P0044?

The estimated repair cost for P0044 is $11–89. Actual cost depends on your vehicle, location, and labor rates.

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