Very annoying that the foxwell number scheme is useless. The 510/520 is the helpful one.

Lean codes usually are intake and I would look into the disa valve if you have the 3.0 (I can't look at the original post when using tapatalk.

Abs gremlins are horrible. The problem with a car that has had the trifecta for a while, multiple things may have broken in addition to the initial fault condition.

If you can get wheel speeds reliably then the problem is likely the abs module, there's a known design flaw that causes the bond wires to break.

Send in repair is about $200

I had an abs sensor "soft fail" when I left it in while removing a hub for bearing replacement. It worked most of the time but had intermittent issues that would bring up trifecta.

Drive around slowly while trifecta off and pay attention to any clue like hitting a bump.

I had trifecta from a loose wheel sensor. I wrapped some Teflon around it and has been working for about two years since.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)