2000 honda s2000 123,000 miles, just bought it, the check engine light is on and i got it scanned it read incorrect aiflow, the top of the intake box is off and there is a cone stlye filter on the intake pipe, what can cause this code,

i did not do the intake mod it was like that when i bought it.

 

probably faulty map sensor?

 

You know when the top of the intake box is off your car is sucking in hot air...

 

yeah i know like i said i didn't do it and i dont have the cover for it, i guess the previous owner wanted the sound. i cleared the code and it hasn't came back yet, but i didnt fix anything so i am expecting it to come back on. just wanted to know what faulty electronics could throw this code.

 

Just making sure cuz a lot of people take them off. I doubt the code will come back...

 

Check all your vacuum hoses!

 

^x2 it could be your secondary air injection system. I threw a code for that too and it I couldent figure it out for the longest time. The metal vacum lines that run to the seconday air injection system valve and solonoid rubbed against my strut bar and created a hole in both of the lines. this was causing the incorrect flow. So check all your vacume lines.

 

There is actually a service bulletin on all 00-05 s2k's (SB 06-055) it says the air pump relay can stick and cause the air pump to overheat and throw a number of codes one of which being being p0411 (secondary air injection system incorrect flow)

 

okay my cel came back on and i checked all the hoses going to the box and the solenoid and they are all new and in good shape, but i dont know if theyre on the right way, does anyone know how i can check to make sure the air pump relay is working

 

check to make sure that the plug right behind the intake box is plugged in. i just recently had my clutch done and i got the same CEL and prolly the same code.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by m1northreat &raquo;</TD></TR><TR><TD CLASS="quote">check to make sure that the plug right behind the intake box is plugged in. i just recently had my clutch done and i got the same CEL and prolly the same code. </TD></TR></TABLE>

I agree. This code is either your vacuum lines not seated properly, or your vacuum control soleniod valve disfunctioning.

I had to replace mine after 95K (just a month ago). Small valve bolted to the rear of the intake box. I got mine used from a member on s2ki for $25.00 shipped... Give that a look

 

finally got around to taking off my bumper to check the air pump, it was all good, so i started replaceing all my vacuum lines and i found a cut in the one by the firewall connected to a vacuum soenoid and that fixed it thanks for all your help.

 

lol told you it was one of the lines. oh well i did the exact same thig i tore that **** apart b4 i found the two holes that rubbed through.

 

danit the stupid light is back on, i guess i need to change some more vacuum lines
the code was p0411

 

well i replaced all vacuum lines and the light still comes back on after resetting the ecu, does anyone have pics of the vacuum diagrams or theyrs engine bay up close where the hoses are and know which way the check valve is supposed to go.