i recently had my engine swapped out. right away my CEL came on, but i reset it without even checking the code.

today (few days later) it came on again. this time i checked it and got code 45:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">System Too Lean or Too Rich malfunction in the fuel monitoring systems</TD></TR></TABLE>
what would be causing this, is it a major problem, and how do i fix it?

when i got the new motor (lower mileage f23) i also had an ebay cold air intake put on, could this cause it?

i don't know if it matters, but both times it came on i was going about 30mph and not really accelerating.
when it came on it just lights up, and does not flash.

EDIT: my car is a 1999 accord lx sedan, I4 w/manual transmission

 

ummmm im guessing oxygen sensor?

 

Get the real code, have it checked with a scan tool, then you might find out if it too rich or too lean.
Using the jumper pin method to get the flash code is an inaccurate method.
You have an OBD2 computer and then are pulling up OBD 1 codes.

Just because the O2 sensor is reporting the condition, does not mean the O2 sensor is bad for sure.
The old saying; "Don't shoot the messenger" comes to mind

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The-Kid &raquo;</TD></TR><TR><TD CLASS="quote">ummmm im guessing oxygen sensor?</TD></TR></TABLE>
It could be. Could also be caused by low fuel pressure or a vacuum leak.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondadude &raquo;</TD></TR><TR><TD CLASS="quote">Get the real code, have it checked with a scan tool, then you might find out if it too rich or too lean.
Using the jumper pin method to get the flash code is an inaccurate method.
You have an OBD2 computer and then are pulling up OBD 1 codes.

Just because the O2 sensor is reporting the condition, does not mean the O2 sensor is bad for sure.
The old saying; "Don't shoot the messenger" comes to mind
</TD></TR></TABLE>

i've never actually used a real scanner, so i didn't realize it could give more info.

just talked to the guy that swapped the engine, and he thought it could be dirty fuel injectors.

so i'm gonna try a can of seafoam in the gas and maybe the vacuum line treatment as well, who knows how long that motor was sitting before i got it.

i might try getting someone to scan for the actual code, though. if it's running too rich then my issue could go back to the o2 sensor, but there's no smoke out the tailpipe, so i wouldn't think it'd be running rich.