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2019 LEXUS UX 200
2.0L I4•FWD•AUTOMATIC•gas
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Repairs0Labor476Torque3316Fluid7DTC1942Battery1Maintenance0Recalls0
P0457low severityPowertrain

Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)

on 2019 Lexus UX 200 2.0L I4 · FWD

What this code means

The EVAP system detected a large leak, typically from a loose, missing, or improperly sealed fuel cap. It can also indicate a disconnected EVAP hose.

Symptoms

  • Check engine light on
  • Fuel odor near vehicle
  • Failed emissions test

Common causes

  • Loose or missing fuel cap
  • Worn fuel cap seal
  • Disconnected EVAP hose
  • Damaged filler neck

Diagnostic steps

  1. Check and retighten fuel cap
  2. Inspect cap seal for cracks
  3. Inspect EVAP hoses for disconnection
  4. Perform EVAP smoke test to confirm seal
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