My check engine light recently just came on and I checked the codes. The codes are as follows: 0401 and 0303 which is intake temp sensor and front 02 sensor. I replaced both parts but still the check engine light is on. I reseted the ECU and it was fine. But later the check engine light went on again. I got a computer to diagnose the codes. The computer spit out P125 and P325 which are ECT sensor and Knock sensor. Can anyone explain why it the two different codes? Also where can i find the ECT sensor and knock sensor?? Please let me know thanks.

 

TTT