Computer diagnostics code P0442
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Computer diagnostics code P0442
<TABLE cellSpacing=1 cellPadding=1 width="100%" border=0><TBODY><TR><TD width="70%">I took my 2003 F-150 in to AutoZone, because the service engine light cam on, and I got a code of P0442 Evaporative Emission Control System Leak Detected (small leak) Does anybody know what this means (it's not the fuel cap, I checked that already.</TD></TR></TBODY></TABLE><!--ASP LOGIC-->
Hotshot
Joined: Aug 2002
Posts: 12,679
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From: BC, Canada
Hi Roy and welcome to the forum 
Do you have warranty on your truck still? if so i would take it in and get it fixed.
EVAP codes can be a real pain in the neck to figure out.
This is what the manual says can cause the P0442.........
The PCM monitors the complete EVAP control system for presence of a small fuel vapor leak. The system failure occurs when a fuel vapor leak from an opening as small as 1.016 mm (0.04 inch) is detected by the EVAP running loss monitor test.
After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
Small holes or cuts in fuel vapor hoses/tubes
Canister vent solenoid stays partially open on closed command
Damaged, cross-threaded or loosely installed fuel filler cap
Loose fuel vapor hose/tube connections to EVAP system components
EVAP system component seals leaking (EVAP canister purge valve, fuel tank pressure sensor, canister vent solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve assembly
Do you have warranty on your truck still? if so i would take it in and get it fixed.
EVAP codes can be a real pain in the neck to figure out.
This is what the manual says can cause the P0442.........
The PCM monitors the complete EVAP control system for presence of a small fuel vapor leak. The system failure occurs when a fuel vapor leak from an opening as small as 1.016 mm (0.04 inch) is detected by the EVAP running loss monitor test.
After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
Small holes or cuts in fuel vapor hoses/tubes
Canister vent solenoid stays partially open on closed command
Damaged, cross-threaded or loosely installed fuel filler cap
Loose fuel vapor hose/tube connections to EVAP system components
EVAP system component seals leaking (EVAP canister purge valve, fuel tank pressure sensor, canister vent solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve assembly
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