Q: Why is my engine light on in my 2008 VW Jetta

asked by on

I have a 2008 VW Jetta GLI. Its in pretty good condition. I just bout it in November, second owner. Its running smoothly. Anyway, about a month after I drove it, it started to not turn over right after fueling it. I would have to wait 5 to 10 minutes before the engine would start. This is around the time I noticed the engine light stayed on. This happened for 4 to 5 times in a row. I took it to Advance Auto to get a diagnostic test. It only showed a code for the gas cap. Even after tightening it, the engine light was still on. Eventually I decided to get them to test it again. This time the only code came up was fuel pump. I decided to see if it would help to put a fuel injector treatment in it. After a few days, the engine light went off, and I was able to start the car right after fueling without waiting. Now today, I am driving down the road and saw the engine light coming back on. And it won’t go off. I tried tighting the gas cap, etc. And its still on. Any ideas or experience?

My car has 121500 miles.
My car has an automatic transmission.

Hello. From what you are explaining this is due to a failure in the evap system. If you were having trouble with it after fueling then most of the time it is cause by a failure in the purge valve for the evap system. This valve should be closed when fueling, but if it is open then the fuel fumes will enter the engine causing it to have a harder time starting. I usually test the purge valve and the vent valve to see if they are fine, but it does sound like the purge valve. If you are looking to have this repaired, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the check engine light is coming on] https://www.yourmechanic.com/services/check-engine-light-is-on-inspection

Was this answer helpful?

Hi there. If the check engine light came on for the gas cap and then for the fuel pump, either there is an electrical issue around the fuel tank causing the fuel pump to have a intermittent issue, or the evaporative purge solenoid is not working causing the light to come on. Check the fuel system out and look for any leaking fuel around the fuel tank. If there is no odor or any fuel leaks, then check the purge solenoid on the evaporative canister and see if there is power to it. If there is power to the solenoid and there is no power coming out of the solenoid, then I recommend replacing the purge solenoid . The purge solenoid is designed to trap and recirculate the vapors in the fuel system and if the valve is not working it would be not recirculating the vapors and could be venting the vapors. The vapor sensors would be picking up this and causing the engine light to come on. If you need further assistance with the fuel evaporative leak, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
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. Why is my engine light on in my 2008 VW Jetta

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: Lightning bolt warning on

Hello. Thank you for writing in about your 2010 Volkswagen Routan. This light is an indication that there is a problem with the electronic throttle control. The electronic throttle control is what controls how much gas the van gets when...

Q: I replaced my DRL on my 2016 Jetta but the indicator light is still on

Hi Tony. Thanks for submitting your question today. If the Daytime Running Indicator light is still illuminated after completing these repairs, then it's likely that an error code is stuck in the ECU and simply needs to be removed by...

Q: Broken handle prevents closing securely

The latch will need to be replaced along with the outside door handle. If you need help with this, I recommend having a qualified mechanic come to your location to replace your door latch and exterior door handle to ensure...

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...