fuel

Fuel Cap

for 2021 Honda Civic 1.5L I4 Turbo · FWD

Editorial review:Chris Hackleman — Master Technician · 20+ years · Jeff Moore — Master Lexus & Toyota Mechanic · 20+ years

Difficulty

Easy

Time

6 min

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman & Jeff Moore — 20+ years each). Always follow the vehicle's factory service information and torque specs.

This procedure covers the removal and replacement of the fuel filler cap on a 2016-2021 Honda Civic 1.5L Turbo.

Warnings

⚠Ensure the fuel cap is from a reputable source to maintain proper fuel system pressure and emissions compliance

ℹ️The fuel cap is tethered to the fuel door on this vehicle to prevent loss

Tools required

None required

Parts

Fuel filler cap × 1 — Honda OEM or equivalent with tether

Preparation

Park vehicle on level surface and turn off engine
Allow fuel system to cool if vehicle was recently driven
Open fuel filler door by pulling release lever on driver side floor

Procedure

1
Remove old fuel cap
Turn the fuel cap counterclockwise until it releases from the filler neck. You will hear clicking sounds as the ratcheting mechanism disengages. Continue turning until the cap is completely free.
2
Inspect filler neck seal
Check the rubber seal inside the fuel filler neck for damage, debris, or deterioration. Clean any dirt or debris from the filler neck opening with a clean cloth if necessary.
3
Disconnect tether if necessary
If replacing the cap, disconnect the tether from the old cap by pressing the release tab on the tether connector. Note the orientation for reinstallation.
4
Attach new fuel cap tether
Connect the tether to the new fuel cap by inserting the tether connector into the cap mount until it clicks into place. Verify it is securely attached by gently pulling on the tether.
5
Install new fuel cap
Place the new fuel cap onto the filler neck and turn clockwise. Continue turning until you hear at least 3 distinct clicks from the ratcheting mechanism, indicating proper sealing and torque. Do not over-tighten past the clicking point.

Reassembly

Close the fuel filler door until it latches securely
Verify the tether allows the cap to reach the filler neck without excessive tension

Verification

Start the engine and verify no check engine light appears related to fuel system evaporative emissions (P0455, P0456, P0457 codes)
Ensure the fuel cap clicks at least 3 times when properly tightened
Confirm the tether is securely attached and the fuel door closes properly
Drive vehicle through at least one complete drive cycle to verify the evaporative emissions system operates correctly with the new cap

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