OBD Guide
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P04FB

Crankcase Ventilation Hose Connection Sensor Range/Performance

P04FB is an OBD-II diagnostic trouble code meaning: Crankcase Ventilation Hose Connection Sensor Range/Performance. Common causes: sensor contamination with oil deposits, mechanical damage to the sensor. Estimated repair cost: $22–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–89 (est.)

Symptoms

  • Check Engine Light Is On
  • Possible unstable idle operation
  • Increased oil consumption when the system is depressurized
  • Oil smell when engine is running

Causes

  • Sensor contamination with oil deposits
  • Mechanical damage to the sensor
  • Unstable connection in the sensor connector
  • Partial disconnection of the crankcase ventilation hose
  • Damage to sensor wiring

How to Fix

  1. Read error codes and check for related codes
  2. Inspect the crankcase ventilation hoses for disconnects and cracks.
  3. Clean the sensor from oil deposits
  4. Check the sensor connector and wiring for unstable connections.
  5. Measure the voltage of the sensor signal in different engine operating modes
  6. Replace the sensor if the parameters do not correspond to the norm
  7. Reset the error and check the system in several modes

Related codes

P04E1P04FCP051CP0171P0172

Error P04FB by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P04FB code mean?

P04FB is an OBD-II diagnostic trouble code that indicates: Crankcase Ventilation Hose Connection Sensor Range/Performance

What causes a P04FB error code?

The most common causes of P04FB include: Sensor contamination with oil deposits; Mechanical damage to the sensor; Unstable connection in the sensor connector; Partial disconnection of the crankcase ventilation hose.

How do I fix a P04FB diagnostic trouble code?

To fix P04FB: Read error codes and check for related codes. Inspect the crankcase ventilation hoses for disconnects and cracks.. Clean the sensor from oil deposits. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P04FB?

Yes, but get it checked soon

How much does it cost to fix P04FB?

The estimated repair cost for P04FB is $22–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat