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I have been having the check engine light come on and off…

Hello, I have been having...

Hello,
I have been having the check engine light come on and off since 2015 when I purchased my vehicle, but it always resolved over time after re-tightening the fuel cap. I even had my fuel cap replaced by you guys last summer, which seem to help.
Last week I experienced my vehicle having issues accelerating with the check engine light now doing a little different activity, flashing. I did a little research and replaced my purge valve solenoid (on 3/22/2018), which seem to have resolved the issue until today (3/27/2018). The engine began to run lean which caused the EPC light as well as the flashing check engine light come on. I got a diagnostic at a local auto parts store, which gave me 2 codes, P0456 & P0302. The P0456 is the same code I had seen previously but the P0302 had never occurred. I addressed that code by replacing the #2-cylinder coil as well as replacing the sparkplug with new. This seem to have stopped the engine from running rough as well as the EDC light went off however, I could still feel a little hesitation. I watched the gauges and saw it moved from the middle maker of 190 to slightly above (not staying just going back and forth).

Mechanic's Assistant: Does the light stay on, or does it blink?

It does both

Mechanic's Assistant: What is the model of your '15 VW?

I have 2013 VW Passat SE

Mechanic's Assistant: Are you fixing your Passat yourself? What have you tried so far?

Hello,
I have been having the check engine light come on and off since 2015 when I purchased my vehicle, but it always resolved over time after re-tightening the fuel cap. I even had my fuel cap replaced by you guys last summer, which seem to help.
Last week I experienced my vehicle having issues accelerating with the check engine light now doing a little different activity, flashing. I did a little research and replaced my purge valve solenoid (on 3/22/2018), which seem to have resolved the issue until today (3/27/2018). The engine began to run lean which caused the EPC light as well as the flashing check engine light come on. I got a diagnostic at a local auto parts store, which gave me 2 codes, P0456 & P0302. The P0456 is the same code I had seen previously but the P0302 had never occurred. I addressed that code by replacing the #2-cylinder coil as well as replacing the sparkplug with new. This seem to have stopped the engine from running rough as well as the EDC light went off however, I could still feel a little hesitation. I watched the gauges and saw it moved from the middle maker of 190 to slightly above (not staying just going back and forth).

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

If you send all the data i just sent

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Answered in 1 minute by:
3/27/2018
Mike V.
Mike V., Auto Service Technician
Category: Car
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Experience: 25 years of experience, Certified Subaru Technician and Nissan factory trained.
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The flashing check engine light is the result of the P0302. This code is for a misfire on cylinder #2. This can be caused by a bad plug, or ignition coil. Usually it's not to bad a repair.

P0456 is for a very small leak in the evap emissions system. This can be caused by a bad gas cap but if the cap is good and tight, you really need to have a smoke test done to find the location of the leak, then do the repair.

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Thank you so much!

Mike V.
Mike V., Auto Service Technician
Category: Car
Satisfied Customers: 26,834
Experience: 25 years of experience, Certified Subaru Technician and Nissan factory trained.
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