OBD Guide
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P0056

HO2S Heater Control Circuit Bank 2 Sensor 2

P0056 is an OBD-II diagnostic trouble code meaning: HO2S Heater Control Circuit Bank 2 Sensor 2. Common causes: open or short circuit in oxygen sensor heater wiring, faulty oxygen sensor with damaged heating element. Estimated repair cost: $6–89.

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

Symptoms

  • The Check Engine light comes on on the dashboard
  • Slight increase in fuel consumption
  • Unstable engine idling in cold weather
  • Deterioration in acceleration dynamics
  • Increased toxicity of exhaust gases

Causes

  • Open or short circuit in oxygen sensor heater wiring
  • Faulty oxygen sensor with damaged heating element
  • Oxidation or corrosion of sensor connector contacts
  • Engine control module (ECM) malfunction
  • Blown heater circuit fuse
  • Poor ground or damaged ground wire

How to Fix

  1. Read error codes and analyze data using a diagnostic scanner
  2. Check the oxygen sensor heater circuit fuses.
  3. Visually inspect the wiring and connectors of the oxygen sensor for damage.
  4. Measure the resistance of the oxygen sensor heating element (should be 2-14 ohms)
  5. Check the supply voltage at the sensor connector (should be about 12V)
  6. Check the integrity of the wires between the sensor and the control unit
  7. If necessary, replace the oxygen sensor
  8. Clear error codes and test drive to verify troubleshooting

Related codes

P0036P0037P0038P0054P0055P0057P0058

Error P0056 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0056 code mean?

P0056 is an OBD-II diagnostic trouble code that indicates: HO2S Heater Control Circuit Bank 2 Sensor 2

What causes a P0056 error code?

The most common causes of P0056 include: Open or short circuit in oxygen sensor heater wiring; Faulty oxygen sensor with damaged heating element; Oxidation or corrosion of sensor connector contacts; Engine control module (ECM) malfunction.

How do I fix a P0056 diagnostic trouble code?

To fix P0056: Read error codes and analyze data using a diagnostic scanner. Check the oxygen sensor heater circuit fuses.. Visually inspect the wiring and connectors of the oxygen sensor for damage.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0056?

Limited driving only, diagnose soon

How much does it cost to fix P0056?

The estimated repair cost for P0056 is $6–89. Actual cost depends on your vehicle, location, and labor rates.

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