OBD II P0300 with P0404

dnemeth51@hotmail.com · **Posted:** Sun Dec 17, 2006 9:28 pm

2002 Chevrolet Impala. It has set two codes P0300 and P0404. The car is running rough and has no power at low RPM's and it seems to regain some of its life at a higher RPM but not at all normal. It sounds like it might be PINING at higher idel speeds. The Plugs and wires were new 6 months ago and it has a fairly clean air filter, Thought I might statr with a fresh fuel filter and check out the EGR.

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jeff compton · **Posted:** Mon Dec 18, 2006 11:13 am

3.1 ? Likey the EGR is sticking or the port through the throttle body is plugged Fuel filter won't fix it!

dnemeth51@hotmail.com · **Posted:** Mon Jan 15, 2007 5:53 pm

The fix for this was a calalitic converter.

jeff compton · **Posted:** Mon Jan 15, 2007 6:12 pm

CarGuy · **Joined:** Sun Oct 15, 2006 11:36 am **Posts:** 22

The new convertor probably fixed the P0300 code but it's likely the EGR code will come back.

crnunn · **Joined:** Wed Feb 07, 2007 8:13 am **Posts:** 1

I changed the converter and it solved it all!!! I had the same problem with my buick 3.1.

OBD II P0300 with P0404

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