ok i search and i couldn't find a answer to my question. is it really bad to drive with this code on? and is it really hard to fix.

 

Fuel Supply System
defective or malfunctioning fuel supply system

it could be the fuel pump. or it might be the fuil pump relay. i wouldnt drive it. it might be runing lean.

 

hey man most of the time on code 43 its not realy your fuel system its your o2 sensor. i had the same problem before.
gl on the fix.

 

oh btw my fuel pump is brand new i just replaced it a month ago.
ok today i just bought a new o2 sensor because i had a cracked in my header so i replaced it. i havent check and see if the code is coming up because it sarted to snow, and got code out. an

 

put gas in it

 

how do u fix that problem i have the same problem but with mine when the check engine light goes on it stopps boggin dont know wat it is

 

so did the o2 sensor fix it. MY buddy's 91integra idle weired at start ups it a 100rpms ha i couldn't believe
it my self

 

i dont know yet im going to see if the code would come up tomarow.

 

Code 43 means replace the O2 sensor, done many of them, have never seen anything else fix this code personally, so its a high percentage that the O2S will do it for you, add in my vote and go OEM ONLY PLEASE, yes it costs more but worth it in the long run.

 

ok i guess when i changed my o2 sensor it took the code away. thanks eveyone for the help.

 

i have a 91 ef si hb with a b18a1 and i was just wondering how many o2 sensors did the car come with from the factory? I have 3 in my header, 2 in the top, and 1 before the cat. only one is plugged in and the car is idling funny and at one point in time it gave me a code 43. i also just replaced the thermostat because it was stuck open. Any other knowledge on this issue would be greatly appreciated. Thanks again

 

A 91 si only had one o2 sensor, and I used the same one for my ls swap.

 

one wire o2 i got like 5 laying around

 

The single O2 sensor needs to sniff all four header pipes to give good feedback to the ECU, so past the collector and before the cat is where it needs to be, not in one of the header pipes.