Parts for your 2003 Honda Accord-Fuel cap

2003 Honda Accord fuel cap — purpose, care, and when to replace

Referencing technical sources including the 2003 Honda Accord Owner’s Manual, the Honda Service Manual (EVAP system section), and Honda Genuine Parts Catalogue listings (fuel filler cap commonly referenced as 17670-SDA-A01), the 2003 Accord is fitted with a conventional screw-type fuel cap. Capless refuelling wasn’t used on this model year, the cap is integral to the EVAP emissions system and a loose or faulty cap can trigger a Check Fuel Cap message or a malfunction indicator (e.g., EVAP leak codes).

The fuel cap on a 2003 Honda Accord does far more than just cover the filler neck. It seals the tank to keep petrol vapours contained, helps maintain the slight vacuum/pressure balance the EVAP system expects, and stops dust, water, and road grime getting into the tank. That tight seal supports on-board diagnostics and emissions compliance, helps prevent fuel odour around the car, and can even reduce evaporative losses over time. Honda specifies tightening the cap until it clicks to confirm the seal is properly engaged.

As part of regular servicing, the cap deserves a quick once-over. A technician or owner should check the rubber sealing ring for cracks or flattening, make sure the cap clicks when tightened, and confirm the tether is intact so the cap doesn’t go walkabout at the servo. Wiping the filler neck lip and the gasket with a clean cloth keeps grit from chewing out the seal.

When is it time to replace the cap? Telltale signs include a persistent petrol smell near the left-rear of the car after refuelling, a cap that won’t click or feels loose, or an EVAP-related warning (often accompanied by a Check Engine light). The 2003 Accord can store codes such as P0455 or P0457 for a large leak or loose cap. A fresh, EVAP-compatible cap is a cheap fix that often restores normal operation after the car completes a few drive cycles.

• Replace the cap if the rubber gasket is cracked, the tether is broken, the cap won’t click, or EVAP leak codes keep returning.
• Choose an OEM or OE-equivalent cap (commonly 17670-SDA-A01 for petrol models) to ensure the correct venting and seal profile.
• After installation, tighten until it clicks, drive normally and the warning should clear without a scan tool.

Question: Which fuel cap fits a 2003 Honda Accord?

Answer: The 2003 Honda Accord uses a conventional screw-type fuel filler cap. A common Honda OEM reference is 17670-SDA-A01 for petrol models in this generation. An OEM or OE-equivalent cap with the correct EVAP-compatible seal and tether is the safe bet, if in doubt, match to the vehicle’s VIN and emissions spec.

Question: Can a loose fuel cap trigger the check engine light on a 2003 Accord?

Answer: Yes. The Accord’s EVAP diagnostics can flag a loose, missing, or perished-seal cap with a Check Fuel Cap message or EVAP leak codes (often P0455/P0457). Refit and tighten until it clicks, the light typically clears after several drive cycles.

Question: How often should the fuel cap be replaced?

Answer: There’s no set interval. Inspect it at every service. Many last 5–10 years, but heat, dust, and frequent refuelling can shorten that. Replace at the first sign of damage, petrol odour, or repeat EVAP warnings.