OBD Guide

P051F

PCV Filter Restriction

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Increased oil consumption
  • Unstable idle
  • Reduced engine power
  • Appearance of oil in the intake manifold
  • Check Engine Light Illuminates

Causes

  • PCV filter dirty
  • Crankcase ventilation system clogged
  • Mechanical damage to the PCV filter
  • Using low-quality oil or not replacing it in a timely manner

How to Fix

  1. Diagnose the PCV system
  2. Stop the engine and let it cool down
  3. Remove and inspect the PCV filter
  4. Replace a dirty or damaged PCV filter
  5. Check the condition of the oil and replace if necessary
  6. Clean the crankcase ventilation system
  7. Reset the error code and check if it appears again

Related codes

Error P051F by Vehicle Brand