FYI: Code 43 Fuel system supply

[wed3k]

is primarily an O2 sensor code. i personally wouldnt bother checking actual fuel components.

O2 sensor signal wire is either high, shorted or the o2 sensor itself has failed (usually low voltage)

in closed loop, O2 sensor feedback is directly related to injector pulse width.

after you replace the o2 sensor and it still has a code, you need to check the voltage and see what the voltage is. if it is still lean, see if it will go rich with carb clean or propane enrichment.

if it reads rich, make a lean condition like a large vacuum leak.

-get a denso for a lower model accord like a dx or lx and just change the plug over. it will save you a couple bucks and if you do everything right it wont affect a thing.

[crazymikey]

Good point.

Hesitation tripped my CEL, scanned it, got code 43. Immediately replaced the 02 sensor and the car ran good as new.

[BLUBB2]

Great info....So is this the primary cause of this code'?
How about a faulty injector or regulator?

[wed3k]

im pretty sure if you took both of those out of the system while the engine was running (not recommended but lets just say you could do it safely) it wouldnt even set a code. the best thing about obd1 is that the engine can melt a piston and it wont set codes but harder to diagnose when you do have an issue.

So, i would have to say that the o2 and o2 signal circuit is the primary cause of this code. Ive never seen anything else.

[wed3k]

bump because people still dont know.

[excalibur02]

Nice! I get this cel every so often... I get it with long drive when I'm less then 1/4 tank of gas.

Btw I only get it with my chipped p28 only.

[wed3k]

check the signal at 2500rpm's when the engine is completely warmed up. it should switch between 200 to 800 mV. you want to back probe or wire tap the signal wire.

[SpdJnky93]

wed3K; awesome info bro, I've been having this problem for a few weeks and losing gas mileage! Again Thanks!

[wed3k]

there's been a lot of questions about it, also if you have an ex, you can buy the LX/DX for 40 dollars, denso unit and just switch the connector and length of wiring. you'll save at least 30 dollars.

some people say you should just buy the correct one. well, how do you explain pristine emissions numbers when i run a mustang 5.0 o2 sensor with my VW corrado?

o2 sensors all do the same thing.

[wed3k]

update: i looked on rockauto and looks like the EX one is only 40 dollars and the dx/lx one is 32 dollars. price went down. ill still buy the other o2 sensor and make a DIY on converting the plug over. probably get a spare plug tomorrow at the junkyard.

[theSOB]

i heard lengthening the wires to the o2 sensor can make it not work as well. is this true or was he blowin smoke?

[wed3k]

depends on how shitty of a job you do. you begin to add resistance and it will throw readings off.

[theSOB]

depends on how shitty of a job you do. you begin to add resistance and it will throw readings off.

so if i do it right and solder it, it shouldnt affect it that much?

[wed3k]

you'll probably have less than .01 ohm through the connector. remember to shrink tube it so no water gets in.

[theSOB]

you'll probably have less than .01 ohm through the connector. remember to shrink tube it so no water gets in.

ok, thanks for the tip