P04E4

Crankcase Ventilation Hose Connection Sensor Circuit Intermittent/Erratic

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–89 (est.)

Symptoms

Check Engine Light Is On
Unstable engine operation
Increased fuel consumption

Causes

Broken or damaged sensor wiring
Malfunction of the sensor itself
Poor contact in the sensor connector
Mechanical damage to the crankcase ventilation hose

How to Fix

Check the integrity of the crankcase ventilation hose
Inspect the sensor wiring and connectors for damage
Check the resistance and signal of the sensor using a multimeter
If necessary, replace the sensor or damaged wires
Clear the error code and check if it returns

Related codes

P04E5 P04E6 P0171