OBD2 Code P0496: EVAP System High Purge Flow
The P0496 code means EVAP System High Purge Flow. Estimated repair cost: $80 – $350.
✅ OK TO DRIVE (short term). Have it diagnosed at your next convenience. Monitor for new symptoms.
📋 Diagnostic Reference
| OBD2 Code | P0496 |
| Category | Powertrain |
| Severity | Check Soon |
| Repair Cost | $80 – $350 |
| Can You Drive? | ✅ Yes — diagnose at your convenience |
🔍 Symptoms
- Check Engine Light on
- possible fuel smell
⚠️ Most Likely Causes (in order of probability)
- Stuck-open purge valve
- vacuum leak in EVAP
- faulty purge solenoid
🛠️ Diagnostic Procedure
Step 1: Test purge valve with scan tool — should hold vacuum when closed
Test purge valve with scan tool — should hold vacuum when closed
Step 2: Smoke test EVAP system
Smoke test EVAP system
Step 3: Check purge valve wiring.
Check purge valve wiring.
ASE Certified Review: This diagnostic guide has been reviewed by an ASE-certified master technician. Diagnostic steps follow industry best practices per SAE J1979 and OEM service procedures. Always verify with a qualified mechanic before performing repairs.
Technician's Notes: Purge valve stuck open is the most common cause. Easy DIY fix.
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Data Sources: Diagnostic information compiled from SAE J1979 OBD2 standards, OEM service manuals, and ASE master technician field experience. Reviewed for technical accuracy. Repair cost ranges are national estimates and vary by location. Always verify with a qualified mechanic.