OBD-II code · Powertrain (generic)
P04E4 Crankcase Ventilation Hose Connection Sensor Circuit Intermittent or Erratic
Same as P04E1 with intermittent or erratic signal. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P04E4?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent contact at connector
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.4–1.2 h
- Emissions test
- Likely to fail
- Parts involved
- Pcv Hose Connection Sensor, Pcv Hose Wiring
Related codes
- P04E1Crankcase Ventilation Hose Connection Sensor Circuit
- P04E2Crankcase Ventilation Hose Connection Sensor Circuit Low
- P04E3Crankcase Ventilation Hose Connection Sensor Circuit High
- P04E5EGR Temperature Sensor D Circuit
- P04E6EGR Temperature Sensor D Circuit Range or Performance
- P04E7EGR Temperature Sensor D Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.