Question about 2003 Hyundai Accent

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AN AUTO TECH USING A DIAGNOSTIC MACHINE GOT A CODE PO442, FOR A SMALL EVAP EMMISSION CONTROL SYSTEM LEAK AROUND 11.26.08 ON MY 2003 HYUNDAI ACCENT. WHAT KIND OF COST CAN I EXPECT TO REPAIR THIS?

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  • bernadinesco Jun 20, 2009

    I did take the vehicle in, but the cost for the diagnostic test was beyond my means. I can say that I recall running over a curb at one point and the problem appearing after that with an engine light. Thanks.

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This DTC (P0442) depends on what caused the code to set. Most times it's simply a loose fuel cap or the O-ring on the fuel cap is damaged OR dirt got between the O-ring and the mating surface of the fuel filler tube. There are numerous possible causes for the DTC you have -- Fuel cap, pin hole in fuel system (evap hoses, fuel tank, fuel cap), canister close valve leaking, fuel tank pressure sensor malfunction, purge control solenoid valve malfunction, etc.
BEST SOLUTION: Take the vehicle into a Hyundai Service Center (dealership), pay the diagnostic fee. They will tell you EXACTLY what the problem is and what's needed to fix it (parts, labor, tax, time-frame, etc.). If you perfer to try and fix it yourself, Go to http://www.hmaservice.com/ and register (vehicle by VIN). Afterward, you'll have access to technical information (manuals, wiring diagrams, service bulletins, etc) about your vehicle.

Posted on Jun 20, 2009

  • Paul McGrath
    Paul McGrath Jun 20, 2009

    You say "you recall running over a curb at one point and the problem appearing after that with an engine light" How HIGH was the curb? You may have damaged components/fuel tank.

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1 Answer

Diagnostic code p0442


CODE PO442 EVAP SYSTEM SMALL LEAK DETECTED A code P0442 most likely means one or more of the following has happened: A loose or improperly affixed gas cap A non-conforming gas cap (i.e. not factory/original brand) A small leak/hole in a fuel vapor hose/tube Other small leak in EVAP system Faulty vent o-ring seal Read more at: http://www.obd-codes.com/p0442 Copyright OBD-Codes.com

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PO442 is the data trouble code for (evaporative emission control system leak detected "small leak") it means that the OBD-II system has detected a small vacuum leak in the evaporative control system.

You will need to find the vacuum leak in the evaporative control system, check for cracked or broken vacuum lines and hoses, especially the vacuum hoses and lines around the evaporative (Evap) canister and the (Evap) solenoid. Also check the gas cap seal for damage.

Vacuum hoses and lines should be checked very well for any cracks or breaks, because they usually hide under the vacuum line or hose.

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you have a small leak in your evap system

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My check engine light on my 2001 hyundai accent gl reads code po441, po442. What does these codes mean?


Most of the time they mean:
p0441 = Evaporative Emission System Incorrect Purge Flow
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MOre info at http://www.obd-codes.com/p0442

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1 Answer

PO442 is the code what is the problem?


Evap leak. (fuel vapor system has a leak). Could be loose gas cap.

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The code PO442 is a small leak somewhere in the evaporative emissions control system, the best way to find that is to take to a shop that does smoke tests for emissions.
As far as the nozzle, try changing the position of it the next time you get gas.

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1 Answer

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P0442 = Evap. Emission Ctrl. System - Small Leak detected (1.0 mm) Most times this is merely a fuel cap which has not been completely tightened. However, the EVAP (Evaporative Emissions System) is quite complex and there are many possible causes other than a loose fuel cap. If you have an OBDII scanner, erase the code and inspect your fuel cap... make sure you 'click' the cap at least three times when you reinstall it. If the code returns, best solution is take it to a Hyundai Service Center (dealership), pay the diagnostic fee. They will tell you EXACTLY what the problem is and what's needed to fix it (parts, labor, tax, time-frame, etc.).

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2 Answers

Check engine light code PO442


You likely won't notice any drivability problems. P0442 indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. 
The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage.
Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

With a P0442, the most common repair is to Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back. Otherwise, replace the gas cap, or Inspect the EVAP system for cuts/holes in tubes/hoses.

Good luck and hope this helps

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01 sonata gls v6...code po455, po442. what are these and how can I pass emissions test in arizona


If you have an EVAP leak, you will get the following codes:

1. P0442 evap emission control system leak (small).
2. P0455 evap emission control system leak (large).

If these codes come up, you need to trace the leak. The most common place for the systems to leak besides the gas cap is at the service port under the hood, the hoses at the purge solenoid, and the hoses around the fuel tank. Check all your EVAP hoses from under the hood , all the way back to the gas tank. You can repair a split hose easily. Buy some 14.5mm EVAP hose at the auto parts store. Just cut the split or cracked section out and attach the new hose.

I can only say that u must fix the code issue and light to pass state emission test, if u reset the light they will know, the system will tell the tester that the system is not ready, this will cause a fail.

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