Q: Check engine light is on, need help with codes

asked by on

A couple months ago, the Check Engine Light came on, and I took it to Auto Zone who helped me to retrieve the codes. Two codes came back about the gas cap being loose, so I tightened it. I know with Jettas, most of the warning lights have to be turned off by hand. I didn't do that, and figured I would have my car inspected later. So I did, and then the mechanic who tried looking at the car said that too many codes are showing up to pass it. I went to Auto Zone again and now the diagnostic tool came back with 7 codes. Here are the codes:

• P0456 Evaporative Emission System Leak Detected (Very small leak) • P0442 Evaporative Emission System Leak Detected (Small Leak) • P0441 Evaporative Emission System Incorrect Purge Flow • P0456 Repeat • P0442 Repeat • P0456 Repeat • P0442 Repeat

I have tried researching this but I am not able to find out the cause of this. Any suggestions? Can this be fixed at home?

What is most likely happening is that you have a small vacuum leak somewhere.

There are many small vacuum lines in the emissions control system. I would recommend having a mechanic who is proficient in emissions diagnostics take a look at your vehicle to check for vacuum leaks with a small scale highly accurate vacuum gauge.

If the vacuum readings are low, the mechanic will then inspect your vacuum lines for any holes or cracks that could be causing this issue. Once the vacuum leak has been found, the hose would be replaced upon your request. YourMechanic offers technicians who can perform services like this at your home or business.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Check engine light is on, need help with codes

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Problems with gear shifting and transmission

It is possible that you could have a worn out transmission mount. The transmission mount is what connects the transmission to the body of the vehicle. The transmission will normally have some movement when it is shifting. The mount...

Q: Engine light keeps turning on, 2006 Dodge Caravan

It sounds to me like the dealership simply tightened the gas cap and didn't charge you for it nor recorded the transaction. Not to worry though. I don't believe tightening the gas cap would be the proper repair. What you...

Q: Q: Transmission won't shift out of second gear

All three problems may be related. You will have to get the computer scanned to see if you have a bad speed sensor. The speed sensor will sense the speed in which you are going; the computer will use this...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...