Engine light is on

subaru
outback

#1

I have a 1998 outback, the engine light is on, I have taken it to the shop, the computer show code 00400 an EGR valve problem, I have changed it out and the problem still exist and my machanic is stumped, and ideas? not effecting the proformance.


#2

Was anything actually checked or tested before just changing out the valve? The code doesn’t say that the valve is bad - only that there wasn’t enough exhaust going into the cylinder. This can happen for several different reasons.

Check this out to move forward: http://www.obd-codes.com/p0400