# P0401 **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [June 16, 2011, 9:44pm UTC](https://community.cartalk.com/t/p0401/65499 "2011-06-16T21:44:12Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Jeffmw05](https://avatars.discourse-cdn.com/v4/letter/j/74df32/32.png) [@Jeffmw05](https://community.cartalk.com/u/Jeffmw05)\ **Post date:** [June 16, 2011, 9:44pm UTC](https://community.cartalk.com/t/p0401/65499/1 "2011-06-16T21:44:12Z")
99 Accord, 4cyl vtec, 160,000 miles. CEL painted 0401 “insufficient EGR flow” last week. Last night I replaced the EGR valve with a brand spanking new one and also cleaned out the EGR port. CEL is still on. Do I need to have a tech. clear the trouble code or will this go out on its own after several cycles on the computer? jmw ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [June 16, 2011, 9:52pm UTC](https://community.cartalk.com/t/p0401/65499/2 "2011-06-16T21:52:01Z")
It should clear itself. ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [June 16, 2011, 11:51pm UTC](https://community.cartalk.com/t/p0401/65499/3 "2011-06-16T23:51:43Z")
You may have changed the wrong part…Somewhere in the system there is a flow sensor, some sort of pressure-sensing device, that generates the trouble code…Also, on some EGR designs, the exhaust gas is routed through a rather small tube that can get plugged up. Fixing this is not critical unless it’s preventing you from passing an emissions test… ---
**Author:** ![Jeffmw05](https://avatars.discourse-cdn.com/v4/letter/j/74df32/32.png) [@Jeffmw05](https://community.cartalk.com/u/Jeffmw05)\ **Post date:** [June 17, 2011, 2:55am UTC](https://community.cartalk.com/t/p0401/65499/4 "2011-06-17T02:55:10Z")
Thanks