P0442 (generic)
EVAP Small Leak Detected
System: Powertrain · EVAP
Severity: minor · Inspection: often fails
Description
Small leak in the evaporative system, typically 0.040". Start with the gas cap, then smoke-test the EVAP system.
Diagnostic snapshot P0442
- Difficulty
- 6/10 — Intermediate diagnostics
- Est. repair cost
- $120 – $450 (parts + typical shop labor)
Diagnostic workflow
- Confirm P0442 with a live scan — note pending vs stored and freeze frame data.
- Inspect wiring/connectors and related sensors before replacing modules.
- Clear codes and road-test; re-scan after two drive cycles if the monitor must set.
Topics
- OBD-II and scan tools (guide)
- Powertrain DTCs (P-prefix) (system)
Related symptoms
None linked yet.
Common fixes (curated)
None linked yet.
Related articles
- Check Engine Light P0442 2019 Toyota 4Runner Fix
- Check Engine Light for Small EVAP Leak 2019 Toyota Yaris
- Diagnosing Small EVAP Leak Code P0442 2018 Toyota Corolla
- Diagnosing Small EVAP Leak Code P0442 2020 Toyota Fchv-Adv
- Check Engine Light for Small EVAP Leak on 2019 Toyota Sequoia
- Check Engine Light for Small EVAP Leak 2020 Toyota Camry
- Check Engine Light P0442 2017 Toyota Tacoma: EVAP System Leak
- Check engine light for small EVAP leak 2020 Toyota Corolla
- Check Engine Light P0442 2017 Toyota Yaris: Small EVAP Leak Fix
- 2019 Toyota Tacoma EVAP System Small Leak Check Engine Light
- Finding a Minor EVAP System Leak DIY 2002 Toyota 4Runner
- Diagnosing a small EVAP system leak 1997 Toyota Paseo
- Finding a Minor EVAP System Leak DIY 1997 Ford Aspire
- Check Engine Light P0442 1996 Ford Cf7000: EVAP Leak Fix
- Check Engine Light for Small EVAP Leak 2001 Toyota Camry Solara
- 1996 Ford F-700: Check Engine Light, Small EVAP Leak Diagnosis
- Symptoms of a Cracked EVAP System Hose Leak 1999 Toyota Celica
- 1997-1999 Honda Odyssey EVAP System Small Leak Diagnosis & Fix
- 1997-1999 Honda Pacific Coast EVAP system small leak
- EVAP system small leak 1996 Ford Probe
- P0442 field guide: EVAP small leak detected
Diagnostic bundle (JSON)
Machine-readable graph: related codes, symptoms, fixes, topics, articles, and curated sources rows. Append &external=1 for optional YouTube / Google CSE hits when API keys are configured (see web/.env.example).