jim milewski Posted October 24, 2009 Share Posted October 24, 2009 new to Subarus and this forum, I just replaced the MAF meter so I'm back and running, two codes left are P0325 and P0400, anything i should know (like where the knock sensor and EGR valve are located is a good start), any methods to test them , thanks Quote Link to comment Share on other sites More sharing options...
lmdew Posted October 24, 2009 Share Posted October 24, 2009 The knock sensor is just behind the intake manifold on the drivers side. Look straight down, it's black about 1.25" in dia and has a 12mm bolt. There is an ohm check you can do for resistance. The EGR is also on the manifold, drivers side. With the car running, pull a vacuum and if the idle changes, the valve is clear. Lots of times the valve or line from the cylinder plug. Start with cleaning them if necessary. Quote Link to comment Share on other sites More sharing options...
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