Loose or damaged fuel cap. Cracked EVAP hose. Faulty purge valve. Leaking charcoal canister. Damaged filler neck.

Which cars are affected by P0442?

P0442 is most commonly reported on Ford, Vauxhall, Toyota, Nissan, Hyundai vehicles, but can appear on any make.

P0442

Low severity

EVAP System Small Leak Detected

A small leak has been detected in the evaporative emissions control system. This system prevents fuel vapours from escaping into the atmosphere.

Get a full AI diagnosis for your vehicle

Enter your reg plate and fault code — Velocito.ai cross-references technical databases, MOT history, manufacturer recalls, and known fixes to pinpoint the exact cause.

Diagnose P0442 free3 free searches — no card required

Common causes of P0442

1Loose or damaged fuel cap

2Cracked EVAP hose

3Faulty purge valve

+2 more causes

Get all causes ranked by likelihood for your specific vehicle — plus the cheapest confirming test for each.

Diagnose P0442 free

Commonly affected vehicles

FordVauxhallToyotaNissanHyundai

P0442 can appear on any vehicle — these are the makes where it is most frequently reported.

Full diagnosis report

Most likely cause for your vehicle

Based on your vehicle's make, model, year, and MOT history, the most probable cause is identified and ranked by likelihood.

Confirming diagnostic test

The cheapest test to confirm the root cause before replacing any parts — saving time and money on unnecessary work.

Recalls & technical bulletins

Manufacturer recalls and TSBs checked automatically for your specific vehicle, so nothing gets missed.

Unlock the full report

Enter your reg plate to get causes ranked for your specific vehicle, confirming tests, recall checks, and known fixes.

Try 3 free searches

Stop guessing. Start diagnosing.

Enter your reg plate and P0442 — get a full diagnostic report in seconds.

Try 3 free searches

Related fault codes

P0171Medium

System Too Lean (Bank 1)

P0300High

Random/Multiple Cylinder Misfire Detected

P0420Medium

Catalyst System Efficiency Below Threshold (Bank 1)

P0172Medium

System Too Rich (Bank 1)