P260F
EVAP System Monitoring Processor Performance
The dedicated EVAP monitoring processor (often a small auxiliary CPU inside the engine controller or a separate module) does not pass its self-test or runs out of step with the main monitor logic.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Common causes
Ordered by how often each turns out to be the cause.
- Internal fault in the monitoring processorCommon
- Software memory corruptionPossible
- Module software outdated, reflash may resolveLess likely
Parts involved
- EVAP Monitor Processor
- Control Module
P260F is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.