2021 Honda Insight EXFACTORY OEM SERVICE PROCEDURE

Malfunction Threshold

Either of these conditions occurs:

When the fuel tank internal pressure is not near the barometric pressure.

Leak check pressure sensor at the time of the decompression Malfunction judgment DTC
Canister decompression Judgment 1 Judgment 2 Judgment 3
Reference pressure more than canister decompression Normal Normal Normal -
Reference pressure is less than canister decompression Normal Failure Normal P04EF

When the fuel tank internal pressure is near the barometric pressure.

Leak check pressure sensor at the time of the decompression Malfunction judgment DTC
System total decompression Canister decompression Judgment 1 Judgment 2 Judgment 3
Reference pressure more than system total decompression Fuel tank internal pressure is no change Normal Normal Normal -
Fuel tank internal pressure is change Normal Normal Failure P2450
Reference pressure is less than system total decompression Reference pressure more than canister decompression Failure Normal Pending P04EE
Reference pressure is less than canister decompression Pending Failure Pending P04EF
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.