| Price | Source | What It Covers | Dated |
|---|---|---|---|
| $138 to $150 | RepairPal | national average estimate, parts and labor | 2026-09-03 |
Notes From The Sources
- RepairPal says parts are typically around $114. Excludes taxes and fees and does not factor in location.
CarMD Rankings
Before You Pay For The Part
EVAP codes point at an area, not a part. A shop should run the carmaker's test or a smoke test first. How the gas cap works, and see what a check engine diagnostic costs.
By Anthony Limpert, co-founder of Supercanic in San Jacinto, California, a shop with ASE certified mechanics. Updated November 12, 2026.
Author Source EEAT Authors · Anthony's Author Page
Sources For This Page
- Gas Cap Replacement Cost Estimate, RepairPal, read 2026-11-12
- Annual CarMD Check Engine Light Report, Catalytic Converter Tops List, CarPro (reporting the 2026 CarMD Vehicle Health Index), read 2026-11-12
- Report, Average Car Repair Costs Were Down in 2024, Cars.com (reporting the 2025 CarMD Vehicle Health Index), read 2026-11-12
- 10 Most Common Check Engine Light Related Repairs, Vehicle Service Pros (reporting the 2023 CarMD Vehicle Health Index), read 2026-11-12