First post here guys (and gals) so be kind.
Not new to forums, just this one.
I have a 2015 LR4 HSE Lux, 68K miles, that is throwing misfire codes. Saturday morning was around 18F degrees here in Chicago and it happened on the cold start only. Once the engine warmed up not more than a minute, I was able to clear the codes with a basic scan tool I have. After that it was fine the rest of the day...even with the car sitting for hours before restarts. Unfortunately my scan tool doesn't allow me to go too in-depth. (Yes, I ordered an IID scan tool but it won't be here for a while yet.).
Codes are P0300, P0302 and P0303 on Saturday and on Sunday morning add P0301 to those as well (and 22F degrees). (Screen shots attached.) Seems to me one entire bank. Again, they clear with my current scan tool and don't come back but I'm beginning to see a pattern here with the temps perhaps. Other cold start days haven't affected it up to this point, which leads me to my next point.
So, what have I had done to it recently? Had the passenger side valve cover resealed for seepage/leak by what I thought was a competent mechanic and don't know if the two are related or not based on the fact that he probably had to disconnect quite a few vacuum lines and maybe even the spark plug wires to get to it. At this point all I'm looking for are some obvious possibilities I can fiddle with before I go back to the mechanic and ask him to have another look at it. I'm decently competent under the bonnet but if it's beyond my skill level pay grade I'd at least like to go into it with him with some confidence knowing what it *might* be. TIA!


I have a 2015 LR4 HSE Lux, 68K miles, that is throwing misfire codes. Saturday morning was around 18F degrees here in Chicago and it happened on the cold start only. Once the engine warmed up not more than a minute, I was able to clear the codes with a basic scan tool I have. After that it was fine the rest of the day...even with the car sitting for hours before restarts. Unfortunately my scan tool doesn't allow me to go too in-depth. (Yes, I ordered an IID scan tool but it won't be here for a while yet.).
Codes are P0300, P0302 and P0303 on Saturday and on Sunday morning add P0301 to those as well (and 22F degrees). (Screen shots attached.) Seems to me one entire bank. Again, they clear with my current scan tool and don't come back but I'm beginning to see a pattern here with the temps perhaps. Other cold start days haven't affected it up to this point, which leads me to my next point.
So, what have I had done to it recently? Had the passenger side valve cover resealed for seepage/leak by what I thought was a competent mechanic and don't know if the two are related or not based on the fact that he probably had to disconnect quite a few vacuum lines and maybe even the spark plug wires to get to it. At this point all I'm looking for are some obvious possibilities I can fiddle with before I go back to the mechanic and ask him to have another look at it. I'm decently competent under the bonnet but if it's beyond my skill level pay grade I'd at least like to go into it with him with some confidence knowing what it *might* be. TIA!

