Diagnosing P0442 on Your Acura Integra
A P0442 code on your Acura Integra indicates the PCM detected a small leak in the evaporative emission system. Built on the Honda Civic platform, the Integra benefits from Honda's straightforward and reliable EVAP design.
Integra EVAP System
The Integra's 1.5L VTEC Turbo engine shares its Civic-based platform DNA, using Honda/Acura's standard EVAP system with a bypass solenoid valve, canister vent shut valve, and charcoal canister. The PCM monitors pressure to detect leaks of approximately 0.020 inches.
Most Likely Causes
- Gas cap seal issue (40%) — Honda/Acura's #1 P0442 cause. The gasket may have minor wear or contamination.
- EVAP hose connection looseness (25%) — Vapor line connections can loosen from driving vibration.
- Bypass solenoid valve issue (15%) — The turbo engine's intake variations can stress the purge valve seal.
- Canister vent shut valve malfunction (10%) — Incomplete sealing during the leak test.
- Charcoal canister fault (10%) — Road debris damage to the canister.
Diagnostic Steps
Replace the gas cap first — a genuine Acura/Honda cap ensures the correct seal pressure. If the code persists, an Acura dealer with HDS provides thorough testing. A smoke test pinpoints the leak.
Repair Costs
- Gas cap: $15–$40
- EVAP hose repair: $80–$210
- Bypass solenoid valve: $110–$260
- Canister vent shut valve: $100–$240
- Charcoal canister: $200–$420
- Smoke test: $80–$150
Warranty
Your Integra is within Acura's 4-year/50,000-mile basic warranty. The 6-year/70,000-mile powertrain warranty and federal 8-year/80,000-mile emissions warranty provide additional coverage. Contact your Acura dealer for warranty repair.