Service Buddy
Emissions

Code P0442

EVAP System Small Leak Detected

Plain English Meaning:A small leak in the fuel vapor system is detected

Green: Safe to Drive

This is usually not dangerous but should be fixed

P0442 Symptoms

  • Check engine light fuel smell sometimes

Most Common Causes of P0442

1Loose gas cap cracked hoses faulty purge valve

P0442 Repair Playbook

Required Mechanic Tests

A qualified shop should perform these tests before replacing any parts to ensure they aren't guessing:

Smoke test EVAP system inspect gas cap and lines

Typical Fix Paths & Estimated Costs

Tighten or replace gas cap fix hoses $20–$300

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Parts for P0442 Repair

Common replacement parts for emissions codes. (Paid links)

Oxygen (O2) Sensor
$25–$80 · Est. Price
Catalytic Converter
$150–$400 · Est. Price
EGR Valve
$40–$120 · Est. Price

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