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2010 FORD FOCUS
2.0L I4 Duratec•FWD•DCT•gas
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Repairs0Labor499Torque3450Fluid7DTC1578Battery1Maintenance0Recalls0
P3035moderate severityPowertrain

Variable Valve Timing Oil Control Valve Flow Restricted Bank 1

on 2010 Ford Focus 2.0L I4 Duratec · FWD

What this code means

The oil control valve that directs oil to the VVT phaser on Bank 1 has restricted flow, causing slow or incomplete cam phasing.

Symptoms

  • Check Engine Light
  • Delayed VVT response
  • Cold start rattle lasting longer than normal
  • Slight loss of power
  • Idle quality gradually worsening
  • Oil change does not resolve symptoms

Common causes

  • OCV screen clogged with debris
  • OCV spool partially stuck
  • Oil gallery partially blocked
  • Varnish buildup in OCV
  • Wear debris from timing chain

Diagnostic steps

  1. Monitor VVT response time to commanded changes
  2. Remove and inspect OCV screen
  3. Test OCV flow rate off vehicle
  4. Check oil gallery for restrictions
  5. Ultrasonic clean OCV if applicable

Repair notes

Replace oil control valve. Inspect OCV screen. If excessive debris is present, investigate source (timing chain wear, bearing wear).

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