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15/08/2021 9:23 am
Topic starter
Hi everyone!
I'm looking to buy a 2006 Mazda 3 with 110k miles on it. The diagnostics gives me few error codes (P0420 and P0328). I did some research and the errors might be due to faulty knock sensor. How bad of an issue can it be?
1 Answer
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15/08/2021 11:30 am
It can get pretty expensive to replace the CAT (P0420). I would replace the knock sensor (P0328) first to see if it clears it up. $28.99 at Autozone.
