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Discussion Starter #1 (Edited)
I read my ECU and it came back with the 0304 code, the knock sensor/circuit. What exactly is the knock sensor? Lately iv been getting really bad gas mileage and read on a few posts thats what other ppl have had also. my car doesn't idle weird or anything. last tiem i checked the ecu it had some error codes but i didn't write them down and they hadn't come back yet but the 0304 kept coming back. What could correct the problem or what could be causing it?
 

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The Don.
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6,151 Posts
Wow, everyone seems to be getting knock sensor problems all of a sudden.

The are a lot of posts on this here. In short, a bad KS doesn't seem to affect mileage by much. You need to check and see if the engine is running rich because this CAN affect mileage.
 

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Senior Member
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1,484 Posts
The knock sensor will not adjust timing, it is thrown most of the time as a security code letting you know that something else is wrong. I still dont know why they did this.
 
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