Hello, I have a 2006 Subaru Outback SUS LLBean 3.0r. For reference the 3.0r has VVT, it has 155k miles on it, I do not know if the timing chain, guides, or tensioner have ever been serviced . I have 6 codes: P0021 and P0011, P0016, P0018, P0028, and P0442. I've been doing a bit of research...