Definition of the engine U1158 Code is found online as well as in the car manual. You need to know the real meaning of the code from the car manufacturer. However, the code has different meanings from the different car manufacturers. You should collect the right meaning and the right meaning of the code is found in the car engine manual. The network problem is found in the car engine and the code is also related with the car engine. The lifters are powerless to elevate their mate pushrods under the valve rocker arms, subsequent in valves that cannot be motivated and remain closed.