My 2009 TL was sitting in the garage for an extended period due to harsh winter. When i went to start it, battery would barely turn over. Put battery charger on car for a few hours and car started and ran fine.
Problem is that a few days later my check emission system light came on, NAV codes state P0305, P0306, P0304, P0300. Engine may not operate properly, acceleration may be reduced.
I am not sure if battery has anything to do with this or not.
Any ideas on the code ?

 

misfire codes p0305 is cyl 5 p0306 is cyl 6 304 is cyl 4 and p0300 is random misfire code no specific cylinder.You sure it ran ok after it sat and started?You can have the codes cleared with a scanner or just pull a battery cable for a few mins and see if it recodes again.Are you still under warr?Have a dealer check it out let them clear it so if it recodes its on file.Maybe they have a bulletin on this?

 

Thanks,
Still under warranty.

 

could also be winter fuel mix.... if you live in the northern part of the country, they put additives in the fuel for the winter

my Type-S (UA7) would ALWAYS throw emissions codes in the winter, if i let her idle too long. i never had a problem with my 4G though

 

I think it may have something to do with the extend storage + stale fuel = misfire...

 

I am going to take to Dealer, but will have to wait for snow, sllet, and ice to stop.
Northeast.........