Is there anyway to change the knock sensor with out taking off the water bypass pipe. I changed my valve cover gasket the other day and it was not as hard as i thought it was going to be, but when i got down to change the knock sensor there was two pipes in the way and i did not want to bother with it so i was wondering if there was a tool or another way to change that sensor. and i have another question i was wondering if the parts that autozone get are the same ones that the mazda dealer gets, the reason y i ask is cause i got a knock sensor from autozone for 79.99 and it was a wells product and a mechanic told me that wells sucks and that i am better off getting it from the manufacturer. Thanks for yalls help