I have heard that if u have the P0300 misfire problem that if u get the AEM ECU u can program it where the P0300 won't plague u anymore. I don't know if u can reprogam the sensitivity of the knock sensor or what but is this true?

 

It's true, you'll never get a P0300 again with the AEM EMS. When you use the EMS you rid the car of all OBDII functions.

 

Can u use a scanner at all? How do u know if you car is having problems? Will the AEM tell u some how?

 

yes you can calibrate the knock sensor sensitivity to whatever you want. No you can't use a scanner anymore as the stock ecu is gone. Aem won't tell you anything. Just get a good tuner.