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Hey,

I changed the clutch on my 2007 Mazda 3. All went great until 5 min in when the engine light came on. A quick check of the codes and it showed a bad knock sensor. So, changed the sensor, (me once dealer 2 times) changed wiring me once dealer once and then dealer hard wired to the mcu too bypass connections. Well, the light and the code still are happening. Loss of fuel economy and power are happening. Please anyone with any help. I am fairly mechanical, it’s the electrical trouble shooting that is not my best suit.
 
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