Hi guys am new to this form I have Ls460 American specs. It's running fine and I went a wrong garage to fix the oil leak from the head cover. And when reassembled it it gave me p0171 error and sometimes there are alot of miss fires error is on bank 1 which I don't know how to locate and I have checked all previous theards can't find a solution for it. If anyone faced it before and have a possible idea how to fix please help

 

Have you checked if coils are installed properly and connected? What about the MAF sensor on the same side?

 

Check the following..

 

hi thank you. I have checked vacuum lines and maf sensors. I am suspecting the guys may have messed with vac lines but there are not vacuum leaks. However I will replace the maf one on maf two and check if the error comes on bank 2