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98 forester obd codes 2.5 dohc


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#1 jim milewski

jim milewski

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Posted 24 October 2009 - 09:33 AM

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

#2 lmdew

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Posted 24 October 2009 - 09:37 AM

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.




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