OBD Guide
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P0051

HO2S Heater Control Circuit Low Bank 2 Sensor 1

P0051 is an OBD-II diagnostic trouble code meaning: HO2S Heater Control Circuit Low Bank 2 Sensor 1. Common causes: faulty oxygen sensor heater, open circuit in the heater circuit 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 idling
  • Reduced engine power
  • Check Engine Light Illuminates
  • Dips during acceleration
  • Increased toxicity of exhaust gases

Causes

  • Faulty oxygen sensor heater
  • Open circuit in the heater circuit wiring
  • Short circuit to ground
  • Oxidation or corrosion of connectors
  • Faulty heater circuit fuse
  • Problems with the engine ECU
  • Poor contact in the sensor connector

How to Fix

  1. Connect the diagnostic scanner and read the error codes
  2. Check the supply voltage at the oxygen sensor connector
  3. Measure the resistance of the sensor heater (usually 2-14 Ohms)
  4. Check the integrity of the wiring from the ECU to the sensor
  5. Inspect connectors for oxidation and corrosion
  6. Check heater circuit fuses
  7. If necessary, replace the oxygen sensor
  8. Clear error codes and test drive

Related codes

P0050P0052P0053P0054P0055P0056P0057P0058

Error P0051 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0051 code mean?

P0051 is an OBD-II diagnostic trouble code that indicates: HO2S Heater Control Circuit Low Bank 2 Sensor 1

What causes a P0051 error code?

The most common causes of P0051 include: Faulty oxygen sensor heater; Open circuit in the heater circuit wiring; Short circuit to ground; Oxidation or corrosion of connectors.

How do I fix a P0051 diagnostic trouble code?

To fix P0051: Connect the diagnostic scanner and read the error codes. Check the supply voltage at the oxygen sensor connector. Measure the resistance of the sensor heater (usually 2-14 Ohms). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0051?

Limited driving only, diagnose soon

How much does it cost to fix P0051?

The estimated repair cost for P0051 is $11–89. Actual cost depends on your vehicle, location, and labor rates.

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