OBD Guide
ENFRDEESPT

P0050

HO2S Heater Control Circuit Bank 2 Sensor 1

P0050 is an OBD-II diagnostic trouble code meaning: HO2S Heater Control Circuit Bank 2 Sensor 1. Common causes: open or short circuit in bank 2 oxygen sensor heater circuit, burnt out heating element inside the sensor. Estimated repair cost: $33–133.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–133 (est.)

Symptoms

  • Check Engine light on dashboard
  • Increased fuel consumption, especially on a cold engine
  • Increased exhaust toxicity
  • Possible unstable engine operation after a cold start
  • Bank 2 oxygen sensor slow warm-up

Causes

  • Open or short circuit in bank 2 oxygen sensor heater circuit
  • Burnt out heating element inside the sensor
  • Blown lambda probe heater circuit fuse
  • Faulty relay or heater control key in the ECU
  • Mechanical damage or breakage of the sensor connector

How to Fix

  1. Read codes, check for related codes on oxygen sensors
  2. Check the lambda probe heater circuit fuse (usually in the engine fuse box)
  3. Measure the resistance of the sensor heater between the corresponding connector contacts (standard 2–20 Ohms)
  4. Check the supply voltage to the heater when the engine is running.
  5. Inspect the sensor connector and wiring for damage and oxidation.
  6. If the heater is faulty, replace the oxygen sensor of bank 2, sensor 1

Related codes

P0030P0036P0054P0135P0141P0155

Error P0050 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0050 code mean?

P0050 is an OBD-II diagnostic trouble code that indicates: HO2S Heater Control Circuit Bank 2 Sensor 1

What causes a P0050 error code?

The most common causes of P0050 include: Open or short circuit in bank 2 oxygen sensor heater circuit; Burnt out heating element inside the sensor; Blown lambda probe heater circuit fuse; Faulty relay or heater control key in the ECU.

How do I fix a P0050 diagnostic trouble code?

To fix P0050: Read codes, check for related codes on oxygen sensors. Check the lambda probe heater circuit fuse (usually in the engine fuse box). Measure the resistance of the sensor heater between the corresponding connector contacts (standard 2–20 Ohms). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0050?

Limited driving only, diagnose soon

How much does it cost to fix P0050?

The estimated repair cost for P0050 is $33–133. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat