Toyota Camry P0442
TL;DR
P0442 is a small EVAP leak on the Camry. Usually a loose or worn fuel cap; sometimes a cracked hose or leaking vent/purge valve. Low severity, safe to drive.
Why P0442 shows up on the Toyota Camry
The Camry's EVAP system captures gasoline vapors from the tank and routes them to the engine to be burned instead of escaping into the air. When the computer runs its periodic leak test and finds the seal is slightly compromised, it sets P0442 for a small leak. Because the Camry is a high-mileage, long-lived sedan, the rubber and plastic EVAP components have plenty of time to age, which is why this code is so commonly reported on older Camrys.
Model-typical causes and rough likelihoods
- Loose, worn, or missing fuel cap (around 40-50%) — the number-one cause on the Camry. A cap that no longer clicks or has a hardened seal lets vapor escape.
- Cracked or brittle EVAP hoses (around 20%) — heat and age harden the small vapor lines near the tank and engine bay.
- Leaking canister vent or purge valve (around 20%) — these solenoids can stick or fail to seal, a commonly reported Camry issue.
- Charcoal canister or gasket faults (around 10%) — less frequent but possible on higher-mileage cars.
Owner tips before you spend money
First, remove and re-seat the fuel cap firmly until it clicks several times, then drive for a few days; the light may clear on its own once the system re-tests. Inspect the cap's rubber seal for cracks — a replacement cap is cheap and fixes many cases. If the light returns, have a shop run a smoke test to pinpoint the leak instead of guessing at parts.
Summary
| Code | P0442 |
|---|---|
| Meaning | EVAP system small leak detected |
| Severity | Low |
| Can I drive? | Yes, safe to drive |
| Most common cause | Loose or worn fuel cap |
| Typical repair cost | $15-400 (cap to valve) |
Full diagnostics
For the complete step-by-step diagnostic and repair guide, see P0442 — full diagnostics.
Frequently asked questions
Is it safe to drive my Toyota Camry with a P0442 code?
Yes. P0442 indicates a small evaporative emissions leak on the Toyota Camry, which is a low-severity emissions issue and does not affect the engine, transmission, or your safety. You can drive normally, but you should fix it because the check engine light will stay on and the car will fail an emissions or smog test until it is resolved.
Can a loose gas cap really cause P0442 on a Camry?
Yes, a loose, worn, or improperly sealed fuel cap is the single most common cause of P0442 on the Toyota Camry. The EVAP system must stay sealed to pass its leak test, so a cap that does not click tight or has a hardened rubber seal will trigger the code. Tighten or replace the cap, then drive several days to let the system re-test and clear the light.
How much does it cost to fix P0442 on a Toyota Camry?
On a Toyota Camry, fixing P0442 ranges from about $15-40 for a new fuel cap to roughly $150-400 for a leaking vent or purge valve including labor. A smoke-test diagnosis at a shop typically costs $75-150. Most Camry cases are resolved inexpensively because a faulty gas cap is the usual culprit.