Originally Posted by alex uk
I got the tps light on so another light wont bother me for now
Yes but TPS light is insignificant compared to MIL.
Personally I wouldn't want to run with MIL light on, but TPS wouldn't bother me a bit.
If you don,t have a reader that will clear MIL lights I would buy one for the sake of £25'ish and read the codes and clear the light on a regular basis.
P0401 is a regular error code that comes up when EGR is prevented from working which is "EGR insufficient flow". This obviously comes up because the EGR is prevented from working cos its unplugged and a pressure sensor detects that valve hasn't opened.