yesterday my car was idling and then just all of a sudden threw code 43 and it says fuel supply system. defective or malfunctioning fuel supply system. so what could be causing this?

 

bump, i really need some imput

 

try fixing your 02 sensor first. Most people fix it, and this code will go away. I have this problem, and the 02 sensor unfortunately was not the culprit for me, but hopefully for you that is all it is.

 

thank you, i think i remember that happening to me as well at one point. ill take a look at it

 

I was messing with the O2 sensor a while ago on my nissan stanza, and started it when it was off.. it threw it into safe mode and wouldnt rev past 4500rpms

 

would this cause me to lean out in number 2 and 3 cylinders?

 

I am having the same problem. If you get a fix or if I do post here...

 

well i fixed my O2 wires tonight, hopefully it does the trick, ill drive it tomorrow and let you know how its doing. One question, are you also leaning out on #2 and 3 also?

 

so i drove my car today and it seems better, my air/fuel guage wasnt reading lean anymore and the code hasnt gone on yet.

 

what do you mean fix the wires? i have a code 1 and 43 so im guessing its my oxygen sensor?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dcsportsciv &raquo;</TD></TR><TR><TD CLASS="quote">would this cause me to lean out in number 2 and 3 cylinders?</TD></TR></TABLE>
Check Gas cap (for pressure seal), gas pump, gas filter, clogged injectors, running on low fuel level? Over advanced ingnition? Octane too high? Spark plug temp out of range?