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I have been trying to trouble shoot the Error Code 12 on my 1994 Camry 4 cyl. So far, I have no clue. I have checked all of the sensor connectors I can find. I have reset the computer by removing the efi fuse and disconnecting the battery. Each time, the light stays off for about 2 minutes and comes back on, before I can even get out of the driveway. It is an automatic. The speedometer and tachometer both function. It runs good. I need to get safety and emissions done. Not sure what to do.
 

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2008 Saab 9-3
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Code 12: knock control sensor signal

Well, first things first. IS there any knock? What's the mileage look like on this car? Maintaince history?
 
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