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Yes, a loose gas cap can affect an emissions test. A loose or damaged cap can cause fuel vapors to escape, leading to an increase in hydrocarbon emissions, which may result in a failed test. Additionally, the vehicle's onboard diagnostic system may detect the issue and trigger a check engine light, further complicating the emissions testing process. It's important to ensure the gas cap is secure before an emissions test to avoid potential problems.

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2w ago

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Recently too your 2000 Passat for an emissions test and now you get an emissions workshop warning on the display and check engine light you thought it was a loose gas cap Retightened still the same?

Recently took my 2000 passat for emissions test. Afterwards I got emmisions workshop on the display and check engine light. I thought it might be a loose gas cap. Retightened no change!


Can you keep driving while you have the code p0455?

P0455 = EVAP Emission Control System Leak (Large). Could be as simple as a loose fuel cap. You can keep driving. This is only emissions related but it will fail an emissions test.


What does code p0455 mean on a 2007 Chrysler Sebring?

Evaporative emissions large leak, check for loose gas cap or a broken vaccum line from the tank to the engine.Evaporative emissions large leak, check for loose gas cap or a broken vaccum line from the tank to the engine.


Why would the service engine soon light come right after passing an emissions test today on your 1999 gmc Yukon?

This happened to me too. The emissions test broke the diaphragm in the gas cap. Bought a new gas cap and it fixed everything.


What does control system vent malfunction mean?

it's talking about the emissions system. it is probably just a loose gas cap


What is an evaporated emissions leak?

EVAP (Evaporative Emissions) system failure could be caused by a loose gas cap. Inspect gas cap to make sure it is fastened properly. Go here for more info: http://www.2carpros.com/kpages/reading_diagnostic_codes.htm


What can cause an emissions leak on a 2001 Chrysler Town and Country?

The most common leaks are cracked vapor hoses and a loose gas cap.


How do you fix code P0455 for chrysler town and country 2000 evap code?

P0455 - large evaporative emissions leak.Look for any large vapor leak from the fuel system.Normal causes are loose gas cap, cracked or broken vacuum hosesP0455 - large evaporative emissions leak.Look for any large vapor leak from the fuel system.Normal causes are loose gas cap, cracked or broken vacuum hoses


Your check engine suddenly came on while driving?

There is a problem with the emissions system. Check for a loose gas cap. If that is not the problem, seek out the services of a professional.


Honda Emissions light?

The emissions light on a Honda Civic could indicate any number of problems including a loose gas cap. It could also indicate something more serious such as the engine is misfiring.


What does the gas cap warning light mean on a 2008 Chrysler PT Cruiser?

The gas cap warning light on a 2008 Chrysler PT Cruiser means that the fuel cap may be loose, missing, or not properly sealed. This can cause a leak in the fuel system, which affects the vehicle’s evaporative emissions system.


Can the 2001 blazer only use the stock gas cap?

Using an incorrect fuel cap may illuminate the check engine light giving you a code for an EVAP leak and you will fail an emissions test.