OBD Guide
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P0109

Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Intermittent

P0109 is an OBD-II diagnostic trouble code meaning: Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Intermittent. Common causes: faulty map sensor, damaged or oxidized sensor wiring. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Unstable engine idling
  • Loss of power when accelerating
  • Increased fuel consumption
  • Jerks or dips when pressing the gas pedal
  • Difficulty starting the engine
  • Black smoke from the exhaust pipe
  • Check Engine Light Illuminated

Causes

  • Faulty MAP sensor
  • Damaged or oxidized sensor wiring
  • Bad contacts in the sensor connector
  • Cracked or disconnected vacuum hoses
  • MAP sensor dirty
  • Engine control unit (ECU) malfunction
  • Problems with sensor ground
  • Intake manifold clogged

How to Fix

  1. Read error codes with a scanner and clear them to check for reoccurrence
  2. Visually inspect the MAP sensor and its wiring for damage.
  3. Check the connection of the MAP sensor connector
  4. Inspect vacuum hoses for cracks, blockages, or disconnections.
  5. Clean the MAP sensor with a special electronic component cleaner.
  6. Check the sensor supply voltage (should be 5V)
  7. Measure the wiring resistance between the sensor and the ECU
  8. Replace MAP sensor if necessary
  9. Carry out a test drive to check if the problem is resolved
  10. Reread error codes to confirm repairs

Related codes

P0105P0106P0107P0108P0110P0171P0174

Error P0109 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0109 code mean?

P0109 is an OBD-II diagnostic trouble code that indicates: Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Intermittent

What causes a P0109 error code?

The most common causes of P0109 include: Faulty MAP sensor; Damaged or oxidized sensor wiring; Bad contacts in the sensor connector; Cracked or disconnected vacuum hoses.

How do I fix a P0109 diagnostic trouble code?

To fix P0109: Read error codes with a scanner and clear them to check for reoccurrence. Visually inspect the MAP sensor and its wiring for damage.. Check the connection of the MAP sensor connector. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0109?

Limited driving only, diagnose soon

How much does it cost to fix P0109?

The estimated repair cost for P0109 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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