Emissions
EVAP vent valve replacement: what it costs
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $35 | $130 |
| Labor: 0.7 to 1.2 hours × $125 to $175 an hour | $88 | $210 |
| Fees: shop supplies, disposal, diagnostics | $0 | $20 |
| Total, rounded | $120 | $360 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in Boston, $31.54 an hour, times 4 to 5.5 to cover what a shop bills (overhead, tools, insurance, profit). Parts are a band from budget aftermarket to the manufacturer part. Full method.
Not a repair shop, estimates only. Typical range, estimate. Not a quote. Your car, parts and shop change the number.
The vent valve lets air into the fuel tank vapor system. A stuck one can cause EVAP codes, trouble filling the tank, and hard refueling.
What is usually included
- New vent valve
- Inspect hoses and canister
- Clear EVAP codes
- Drive cycle check
What moves the price
- Valve location near the tank
- Charcoal canister replacement
- Cracked vapor hoses or a rusted mounting near the tank
- Smoke test
Questions to ask before you say yes
- Did you test the vent valve?
- Is the canister damaged?
- Are hoses cracked?
- Was a smoke test done?
Can you do it yourself?
A moderate DIY; the location underneath the car makes it harder than the purge valve.
Shopping for the part? Search car parts on eBay (affiliate link, disclosure). Make sure the part fits your car before buying.
Common questions
What are signs of a bad vent valve?
An EVAP code, trouble fueling because the pump keeps clicking off, or a gas cap that seems hard to pull. The valve may be stuck closed.
Why is it hard to reach?
It often sits near the gas tank or fuel canister underneath the car. The shop may need to lower parts or lift the car to reach it.
Could it be the gas cap?
Yes. A loose or worn cap is the most common cause of EVAP codes. Check the cap first. It costs under $20 and is a quick test.
How much does evap vent valve replacement cost?
A typical range in Boston is $120 to $360. That is an estimate from parts prices, labor hours and the local labor rate, not a quote.
Typical range in 10 metro areas
Only the labor rate changes between cities. Same parts, same hours.
| Area | Typical range, estimate |
|---|---|
| Boston area, Massachusetts | $120 to $360 |
| New York City area | $110 to $350 |
| Los Angeles area, California | $110 to $360 |
| Chicago area, Illinois | $110 to $340 |
| Houston area, Texas | $100 to $330 |
| Dallas-Fort Worth area, Texas | $100 to $330 |
| Phoenix area, Arizona | $110 to $330 |
| Atlanta area, Georgia | $110 to $340 |
| Miami area, Florida | $100 to $330 |
| Seattle area, Washington | $120 to $360 |