So... Just as I thought, the PCM replacement did nothing. Finally, Mazda tech support recommended to the tech to check for leaks around the head gasket. Guess what??? Surprise Surprise! Both head gaskets leaking. They replaced the gaskets, flushed the engine, and then gave to their driver...
The PCM is being covered under the 7yr/100k powertrain warranty. I think they're wasting their time & money. Unfortunately, I think I have to stay with the mazda dealer for the warranty work. I think they should be spending their time searching for the leak. Waiting to hear back on the oil...
First time here in this forum; I hope somebody can help. I have a 2009 CX-9 Sport AWD w/50k miles (very low miles). 2 months ago, wife noticed engine running very rough and check engine light came on (solid). Checked with my scanner and found (2x) P0306 [cylinder 6 misfire]. After Google...