Hi guys. My 1999 Honda Accord set the CEL P0401 code (insufficient EGR flow). I reset the CEL and it came back a few weeks later (I think it was a warmer day than the previous days). Anyways, I'm getting about 21 MPG city (I know clogged EGRs can reduce fuel efficiency), is that particularly low?
I've seen some tutorials/videos (none specific to my model). I haven't seen anything that was that good explaining the process. Also I've seen people clean out their whole throttle body / intake manifold which looks pretty complicated.
It doesn't look like I can reach 1 of the 2 bolts (the one closer to the manifold) without removing other parts out first.
Should I just take it to the shop?