Hello again, need some help please.

[Lopt]

Hi everyone. So I found out that my 7mge had a headgasket leak. So I took it upon myself to fix it for a fraction of the cost instead of taking it to a mechanic. hks headgasket, and apr bolts <3

So far it's been a great learning experience, however it's also been terribly frustrating. I can't get her to start since doing the work..

My friend and I have been doing trouble shooting on and off for about two months now and we're at a loss. She is throwing a code 41 and a 51, but I don't think those will prevent her from actually starting up.

The starter is good, the cap and rotor are good, wires are good, she has spark, fuel and air. I'm pretty darn sure i've got all the vacuum lines and the wiring harness in the right spots..

She's strong.. she wants to start, but something is preventing it and I'm about done and ready to tow her to a shop, but I really don't want to.. please help revive her.