P0442 on a Ford Escape

What P0442 usually means on a Escape

P0442 is a small evaporative-emissions leak, the more subtle sibling of the large-leak P0455. On the Escape the leading cause is still the gas cap, since even a slightly loose or worn cap seal can let a small amount of vapor escape. Beyond that, a tiny crack in an EVAP hose, a weeping seal at the fuel tank or canister, or a slightly leaking purge or vent valve can trip it. Small leaks are harder to find than large ones, so a smoke test is usually the efficient way to locate the source.

Most likely causes on this model

1. Loose or worn fuel cap seal

   The most common P0442 cause on the Escape. A cap that seals imperfectly lets a small leak through, so re-seating or replacing it is the first and cheapest step.

2. Small crack in an EVAP hose

   A hairline crack or loose connection in a vapor line produces a small leak that a smoke test can reveal, common as the Escape ages.

3. Leaking purge or vent valve seal

   A valve that seals slightly imperfectly allows a small leak, and either the purge or vent solenoid can be responsible.

4. Seal leak at tank or canister

   A weeping O-ring or seal at the fuel tank or charcoal canister lets vapor escape slowly, tripping the small-leak monitor.

What it costs on a Escape

Like P0455, this is usually inexpensive to fix, with the cap being the cheapest item and valves or hoses only modestly more. The main cost is diagnostic: a smoke test to find a small leak is worth the small fee because small leaks are hard to spot visually. Replacing parts without confirming the source is the way this becomes wasteful.

Fixing it

Start with the fuel cap and clear the code. If P0442 returns, have the system smoke-tested, since small leaks in a hose seal or valve are difficult to find any other way.

For the full step-by-step diagnosis order (any vehicle), see the main P0442 guide.

Other codes we cover on the Ford Escape

Related symptoms

Ford Escape problems & recalls by year