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Thank you for the input. I spoke with our family mechanic this morning and he confirmed that some light oil on the threads with 100k on the clock...
Update: I added photos of the spark plugs to the media section under "Run Hamster Run"
Oil visible on Plug 4 on hex head, light oil discoloration on porcelen
Plugs 1-4 (top to bottom)
Threads wiped onto paper towel
Hi All, We bought a used 2007 prius with 100k on it a couple months ago and it almost instantly started having a misfire issue with CEL. I...