OBD Guide
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P0055

HO2S Heater Resistance Bank 1 Sensor 3

P0055 is an OBD-II diagnostic trouble code meaning: HO2S Heater Resistance Bank 1 Sensor 3. Common causes: failure of the heating element of the oxygen sensor, open or short circuit in heater wiring. Estimated repair cost: $11–89.

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

Symptoms

  • Increased fuel consumption
  • Unstable engine operation at idle
  • Deterioration in acceleration dynamics
  • Increased toxicity of exhaust gases
  • Check Engine Light Is On
  • Difficulty starting a cold engine

Causes

  • Failure of the heating element of the oxygen sensor
  • Open or short circuit in heater wiring
  • Corrosion of sensor connector contacts
  • Oxygen sensor heater relay malfunction
  • Damaged heater circuit fuse
  • Engine control unit malfunction
  • Mechanical damage to the sensor

How to Fix

  1. Connect the diagnostic scanner and read the error codes
  2. Check the oxygen sensor heater circuit fuses.
  3. Measure the resistance of the sensor heating element (standard 2-14 Ohms)
  4. Check the integrity of the wiring from the sensor to the control unit
  5. Inspect the sensor connector for corrosion and damage.
  6. Check the heater supply voltage (should be 12V)
  7. If necessary, replace the oxygen sensor
  8. Clear error codes and test drive
  9. Recheck the system with a diagnostic scanner

Related codes

P0054P0056P0057P0135P0141P0147P0153

Error P0055 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0055 code mean?

P0055 is an OBD-II diagnostic trouble code that indicates: HO2S Heater Resistance Bank 1 Sensor 3

What causes a P0055 error code?

The most common causes of P0055 include: Failure of the heating element of the oxygen sensor; Open or short circuit in heater wiring; Corrosion of sensor connector contacts; Oxygen sensor heater relay malfunction.

How do I fix a P0055 diagnostic trouble code?

To fix P0055: Connect the diagnostic scanner and read the error codes. Check the oxygen sensor heater circuit fuses.. Measure the resistance of the sensor heating element (standard 2-14 Ohms). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0055?

Limited driving only, diagnose soon

How much does it cost to fix P0055?

The estimated repair cost for P0055 is $11–89. Actual cost depends on your vehicle, location, and labor rates.

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