Hello guys
I have check engine light for a P0325. I tested the knock sensor and cable are fine, On petrol and LPG but I still have the code even if I clear it, I have a Mazda 3. 2004 1,6 petrol 200kkm on the counter.

I don't know what should i check next ?

 

How did you test the sensor?

 

I took the car to a mechanic he said he tasted it and its giving the correct voltage, Then he said it seems like its an ECU problem and he needs to reprogram it.

 

You can't test the voltage of knock sensor, only the internal resistance. Only Mazda can reprogram the ECU, which will only be a software update, rather than a reprogram.

 

Thank you for the reply i am thinking maybe i should just replace it and see what will happen. i mean the car runs fine its fast its responsive, all symptoms of bad KS are not there,

a other mechanic said it might be because of LPG installation. that's why the car has a check light.

 

You should of mentioned LPG in your first post. Do you know who installed the LPG?

 

no i don't know who installed it but it was done in Germany, thats all i know its a Voltran LPG kit,

 

Get the code cleared, run it only on petrol for a few weeks and see how it goes. These engines weren't designed for LPG, not saying they can't be run on LPG.

 

Yes i tried that i cleaned the code and ran the car for 15days on petrol 95 unleaded premium and after like 2 days the code was back. I think your right Mazda engines are not so great for LPG however the car runs fine, on both LPG and petrol its just the code keeps getting back.