[eppo37]

Let me start by saying I am SO glad I took my car to Trussville Mazda! It looks like the 8 is finally going to get fixed. Now, lets get to the explaination.

So everything makes sense, I need to tell everyone what went on with the 8 back in January. My coil packs went bad and started dumping fuel into the cat. It got super heated (a few times b/w getting home the night it happened, taking it to Mazda, and Mazda test driving it). That's when I replaced the spark plugs, wires, and first set of coils packs It also fried the O2 sensor. Fast forward to the end of March, when all my problems started. Med Center told me my fuel mixture was off and the converter was the cause. But every test implied the converter was fine. I suggested the wiring harness could have been damaged by the heat way back when. They "checked" it, said it was fine.

Here is what I learned when Trussville Mazda called me yesterday to give me an update...
The tech told me he was getting a lot of "U" codes from the PCM (unfortunately I don't know enough to know exactly what that is). So after looking up the car's history, he checked the wiring harness on the O2 sensor. It seems I have been driving around with an incomplete electrical circuit, and no ground wire on my O2 sensor. They are going to replace the harness, the sensor, and the cat. Depending on what that does or doesn't correct, I might even get a new engine. Needless to say, I never got a compression test, but thanks to everyone for their help.