OBD-II code · Powertrain (generic, extended)
P24D9 EVAP System Pressure Sensor or Switch B Circuit Intermittent
Same as P24D5 with intermittent or erratic signal. The evaporative system captures fuel vapor from the tank and purges it into intake; leaks or stuck purge valves leak hydrocarbons and cause emissions failures.
Is it safe to drive with P24D9?
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
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.4–1.4 h
- Emissions test
- Likely to fail
- Parts involved
- Evap Pressure Sensor B
Related codes
- P24D6EVAP System Pressure Sensor or Switch B Circuit Range or Performance
- P24D7EVAP System Pressure Sensor or Switch B Circuit Low
- P24D8EVAP System Pressure Sensor or Switch B Circuit High
- P24DAParticulate Matter Sensor Exhaust Sample Error Bank 1
- P24DBReductant Purge Control Valve B Circuit Open
- P24DCReductant Purge Control Valve B Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.