Hi,
The P0456 is related to a small leak in the EVAP system. This could be several things. For example, if the fuel cap isn't fully seated, it can cause this. However, if the fuel cap isn't the issue, it becomes difficult to find because it is a "small" leak.
In that case, what you would need to do is smoke test the EVAP system. Basically, smoke is injected into the EVAP system at a very low pressure. Smoke will exit where there is a leak.
The other two codes are related to a misfire. The P0300 indicates a random misfire. That could be caused by a vacuum leak or the P0456. On the other hand, a leak normally won't affect only one cylinder (in this case cylinder 3) which is indicated by the P0303.
Have you noticed any drivability issues? Have you felt a misfire while driving?
As far as the fuel smell is concerned, it is likely related to the EVAP leak. I wouldn't think the burnt oil smell isn't related, but anything is possible. Have you noticed any oil leaks under the hood?
Let me know.
Joe
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Saturday, December 9th, 2023 AT 11:24 PM
