99 Legacy OBW

 

CEL light is on, code says something about EGR flow. I've read all the posts and how to make sure there is no obstruction. Just don't know where the thing is. Does anyone have a diagram of the parts I should be checking? Any other advice would be appreciated.

 

Thanks

What is the specific code?

 

nipper

The egr valve is on rear driver's side of the intake manifold. You'll see a metal pipe going down from it to the rear of the driver's side cylinder head.

There are many components to the EGR system that could cause the code.

The EGR codes can be a pain. This http://www.endwrench.com article has some good info about EGR troubleshooting: Subaru Emissions System Service

What is the specific code?

 

nipper

 

It's a code P0400. EGR Flow Malfunction

I have had quite a few instances of it being the EGR transducer which is that plastic disc with the green label right in front of the EGR valve. Unfortunately the easiest way I have found to trouble shoot this is to have test parts hanging around, all of the parts interchange for all of the ealy style (95-99) cars.

Be sure to check the vacuum line on the right side of the engine that goes to the map sensor on the right shock tower. There is a inline filter that plugs up and sets the same code. The filter is a round plastic cylinder. If you blow thru the line you can tell if it is plugged. When the filter plugs the map does not see the drop in vacuum when the EGR is activated and assumes it is not working. Then it sets the code.