OBD Guide
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P03F9

B Camshaft Position Actuator Position Sensor C Circuit High Bank 1

P03F9 is an OBD-II diagnostic trouble code meaning: B Camshaft Position Actuator Position Sensor C Circuit High Bank 1. Common causes: broken or shorted camshaft position sensor wiring, faulty phase regulator position sensor. Estimated repair cost: $11–222.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$11–222 (est.)

Symptoms

  • Check Engine light is on
  • Unstable engine operation at idle
  • Reduced engine power
  • Increased fuel consumption
  • Jerks when accelerating
  • Difficulty starting the engine

Causes

  • Broken or shorted camshaft position sensor wiring
  • Faulty phase regulator position sensor
  • Contamination or wear of the phase regulator
  • Low oil pressure in the VVT system
  • Contaminated or unsuitable engine oil
  • ECU malfunction (rare)

How to Fix

  1. Connect the scanner and read all error codes
  2. Check the electrical circuit of the sensor: voltage, grounding, wiring resistance
  3. Inspect the sensor connector and wiring for damage or oxidation.
  4. Replace the camshaft position sensor if the circuit is OK
  5. Check oil pressure and compliance with specifications
  6. Clean or replace the phase regulator if there is a mechanical fault
  7. Reset the error and take a test drive to check

Related codes

P0340P0341P0365P0366P03F8P03FA

Error P03F9 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P03F9 code mean?

P03F9 is an OBD-II diagnostic trouble code that indicates: B Camshaft Position Actuator Position Sensor C Circuit High Bank 1

What causes a P03F9 error code?

The most common causes of P03F9 include: Broken or shorted camshaft position sensor wiring; Faulty phase regulator position sensor; Contamination or wear of the phase regulator; Low oil pressure in the VVT system.

How do I fix a P03F9 diagnostic trouble code?

To fix P03F9: Connect the scanner and read all error codes. Check the electrical circuit of the sensor: voltage, grounding, wiring resistance. Inspect the sensor connector and wiring for damage or oxidation.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P03F9?

Do not drive — repair immediately

How much does it cost to fix P03F9?

The estimated repair cost for P03F9 is $11–222. Actual cost depends on your vehicle, location, and labor rates.

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