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Originally Posted by Topless
OK, signal implausible codes mean you have an open circuit in all the sensors listed. Could be a damaged wire harness, failed sensors or failed DME. These codes definitely indicate a car that runs like poo.
Advice: Stop driving/running the car and isolate and test every listed sensor. Maybe a rodent got in there and chewed things up or a harness got too close to a shiny new set of headers and melted. If you don't know how to do this process, find a good local indy who does. Continuing to run the car might just kill it.
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Ok, sounds like the time is right to take it in. I haven't been driving it, just starting it for a minute in the driveway after replacing the O2 sensors, and after swapping in/cleaning the MAF. I'll keep everyone posted. I'll save the MAF replacement for another date. It's easy enough to replace, and I'm sure it'll come due soon.
Edit: I spoke with the local Porsche indy nearby (
http://abauer.com/), and he agreed it's probably damaged wiring, MAF, or added the possibility that it's a fuel pump. I get off work at 3 PM daily (east coast hours, baby) so he agreed to take me into the shop and diagnose it while I'm present. I told him what i've done thus far (fuel filter, precat O2's, cleaned the MAF, disco'd the MAF, new spark plugs, tubes, o rings, new air filter) and he tried to, over the phone, narrow it down, but we agreed it's just time to bring it in.
I'll update y'all tonight with his findings, then we'll see what's going to be the solution.
J