Emissions
Gas cap replacement: what it costs
Wide range: this job varies a lot. Itemize your quote for a better answer.
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $8 | $40 |
| Labor: 0 to 0.3 hours × $110 to $150 an hour | $0 | $45 |
| Fees: shop supplies, disposal, diagnostics | $0 | $10 |
| Total, rounded | $5 | $95 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in the US, $27.13 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.
A loose, worn or cracked gas cap is replaced. It is a common cause of EVAP codes and a check engine light.
Get quotes from local shops
Tell us the job and your ZIP. Free, takes a minute.
Fair Price is not a contractor or a repair shop. Who sees your request
What is usually included
- New gas cap
- Inspect the filler neck
- Clear EVAP codes
- Drive cycle check
What moves the price
- OEM versus generic cap
- Locking cap
- Dealer versus parts store
- Shop minimum charge
Questions to ask before you say yes
- Is the filler neck sealing surface clean?
- Is the cap the right type for my car?
- Do codes clear on their own?
- Do I need to drive before a retest?
Can you do it yourself?
The easiest DIY on this list; buy the cap made for your car.
Common questions
Can a gas cap trigger the check engine light?
Yes. A leak in the fuel vapor system sets an EVAP code, and a cap is the most common cause.
How long until the light goes off?
After you tighten or replace the cap, the light can take a few days of driving to reset. Some shops clear the code to speed that up.
Does a bad cap waste fuel?
A little vapor can escape, but the larger effect is the check engine light and a failed emissions test. The fix is a cheap part.
How much does gas cap replacement cost?
A typical range across the US is $5 to $95. 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 | $5 to $110 |
| New York City area | $5 to $100 |
| Los Angeles area, California | $5 to $110 |
| Chicago area, Illinois | $5 to $100 |
| Houston area, Texas | $5 to $95 |
| Dallas-Fort Worth area, Texas | $5 to $95 |
| Phoenix area, Arizona | $5 to $95 |
| Atlanta area, Georgia | $5 to $100 |
| Miami area, Florida | $5 to $95 |
| Seattle area, Washington | $5 to $110 |