Question about 2001 Pontiac Aztek

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Engine codes say fuel leak- no oder of gas

Mechanic said it may be a faulty gas cap ( had this replaced once under warrenty). Any discount sites where I can buy one online?

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  • James May 11, 2010

    the OE ones work a lot better and perform as they should. I dont think this will correct your problem though. what was the code? do you leave the engine run when you fill up with gas? inspect your gas cap, there is a rubber ring where it seals to the fuel filler neck, if you dont see and cracks in teh rubber chances are that it is fine. You should also look at the top of the filler neck, the upper lip where the cap seals, aree ther nicks in the sealing surface where the fuel nozzle at the gas pump has damaged it, this could be a cause for leaks as well. if you dont see a visual problem in these areas, a gas cap will probably not help.

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When you put the cap back on, allways turn it till it clicks, then turn a little more.

Posted on Jan 04, 2009

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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 Defective vent valve Defective purge valve Defective leak detection pump

Read more at: http://www.obd-codes.com/p0442
Copyright OBD-Codes.com

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Code p0442 and p0455. When I start the truck it takes about 5 seconds to actually start. If I turn it off and start it again, it starts right up.


Well code 442 is a small EVAP leak and 455 is a large leak. Those codes could be a faulty gas cap or any leak in the gas tank venting system including the gasket around the fuel pump. The engine computer pressurizes the gas tank when the engine is running to check for leaks.
The starting issue could be a faulty check valve in the fuel pump allowing fuel pressure to drain back into the gas tank.

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Code po455 2004 chrysler sebring 2.4l sohc G vin code


The code is for a large leak in the fuel tank or evap system.

Some possible cause are - a leaking fuel tank, gas cap, hoses to and from the vapor canister and engine, and a faulty canister.
It's possible a valve is stuck open and allowing the engine to pull fumes in when the system is supposed to be closed, but if this were the case the computer should also set a code for that valve.

Here is the definition.

P0455 CHRYSLER Description The Evaporative emissions (EVAP) system is design to prevent the escape of fuel vapors from the fuel system. Leaks in the system, ca allow vapors to escape into the atmosphere. The leak detection system tests for EVAP system leaks and blockage.


During the self-diagnostics, the Powertrain Control Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults. If the first checks pass, the PCM then uses the LDP to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace the air that leaks out. The PCM determines the size of the leak based on how fast/long it must pump the LDP as it tries to maintain pressure in the system.
Read more: http://engine-codes.com/p0455_chrysler.html#ixzz24EH3F11s

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Volkswagen jetta code P0171


P0171 VOLKSWAGEN - System Too Lean engine cylinder Bank 1
Possible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
P0455 VOLKSWAGEN - EVAP System (fuel vapor storage and control) Large Leak Detected
Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
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Obd code p0457 fuel cap replaced mil reset defect not cleared connection checked ok


The code is for a large leak in the EVAP system such as a loose or missing gas cap. But it could also mean a loose or missing hose to the canister or other leak in the tank.
The computer vents the tank several times an hour while the engine is running, and it checks the system by pressurizing the gas tank. If the tank will not hold pressure the code is set.
You may have to check the top of the tank where the fuel pump gasket is, as well as the vent lines to the front of the car.
A mechanic would perform a smoke test to look for leaks.

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My check engine light came on code P0446; dashboard says "check gas cap" i took it off retightened it and check engine light still on. I noticed that the metal flap for the gas nozzle is...


The metal flap should not trigger the sensor. Once you tighten the gas cap you should clear the code and see if it comes back. Otherwise it will take a while to go away.
If it does come back even though the gas cap is tight it could be the rubber seal around the gas cap replacing that can sometimes fix this issue also.

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1 Answer

Ihave dodge caravan sport 2001 and ihave this code in my car-p0442 how i fixed ?


This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. .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.

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

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
Few places to check - rubber hose under air box (requires removing the air box) and hoses connecting to EVAP system under the van on the drivers side.

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2 Answers

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Do you mean code P0442? I would assume that's what you mean since you said it relates to the Evap System

This code indicates that there is a fuel vapor leak in the system. This means that a very small leak has been detected. The leak can be from a hole as small as 1mm


This code point towards any of the following:
a loose gas cap or a non factory spec gas cap
a small leak or hole in the fuel vapor hose/tube
faulty vent o-ring seal

The most common fixes is to re install the gas cap, clear the codes, and see if the code returns. Or replace the gas cap and clear the codes and see if it returns. Finally inspect the hoses/tubes for cuts/holes

This code in no way points to a canister requiring to be replaced.

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