Rep Power: 0

Okay, my 1995 Honda Civic DV 1.5L non-vtec sat for 8 months while I was trying to figure out how to get the blasted thing going. Which I finally did. After a month of driving it, I get a check engine light code 43...which is, "fuel supply system".

I live in Los Angeles and the temperatures over the past 8 months that the car was sitting was an average of 90 degrees and my car sat in parking garage that was never cold. After I got my car re-started, I added some fuel cleaner to the gas tank. Upon next fuel up, I added a whole engine system fuel cleaner for good measure.

Let me give you facts pertaining to my car...
Fuel filter replaced 3,400 miles ago
Fuel pump and fuel pump strainer replaced 1,300 miles ago
Oxygen sensor replaced 1,300 miles ago
Oil filter and oil replaced 1,300 miles ago

I have NOT replaced the fuel injectors (4 of them) in the last 150,000 miles. This is my only guess as to what could be throwing the check engine light for a code 43 "fuel supply system". Should I clean them, replace them? Any other suggestions of what might be throwing this check engine light. Yes, I know that letting my fuel sit for 8 months is probably not the greatest thing to do. And "no" I did not drain it from my car...it all past through my engine already.

 
Rep Power: 519

43: A problem in the Heated Oxygen Sensor (HO2S) circuit or a problem in the Fuel Supply System.


For SOME reason, the computer did not like what it saw from the O2 sensor. It can't tell you what it saw wrong though. Could be the heater circuit, could be the sensor, could be fuel pressure, could be MANY things.
There is a whole (mysterious) trouble tree for trying to figure out what caused the code in a decent service manual.

If it doesn't run bad, the chart has you checking the O2 sensor and its wiring and voltages..... Was your sensor not an OEM part?

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I got my truck out this year, the gas in it was at least 5 years old. It had a full tank of this 5 year old gas. It started and ran, so I drove it until it was empty. Filled with fresh fuel, and it will probably sit again over the winter now.

 
Rep Power: 0

ezone,

A pleasure always to hear your words of advice. I am not sure if it was a OEM oxygen sensor. I would venture to say not. It was not a known name brand like Bosch. I believe it purchased it off eBay...brand new though.

Curious though, why would the check engine light be thrown with a 43 code for fuel supply system, rather than a code 1 for oxygen sensor? I read somewhere about other suggesting oxygen sensor, but I did not follow the logic. It seems to me that it would stand to reason that if I had a bad oxygen sensor or anything wrong with it, the check engine light would give me a "1" code.

 
Rep Power: 519

A quick glance at that trouble tree shows that code 1 appears to be closely related to the oxygen sensing portion (rich/lean state) of the O2 sensor.

The code 1 chart can dump you into the middle of the code 43 chart.

Quick glance again: Code 43 chart appears to be looking more closely at the heater circuit portion of the sensor and wiring.

I really hate Hondas trouble charts. They just have you checking certain wires without ever telling you why, or what. It takes me a lot of other hunting to figure that part out, and look for better/faster ways to obtain the same readings at easier places to reach.

 
Rep Power: 519

Your definition of the code 43 is too narrow. Read mine again.


That's mainly known to me as way wrong for these cars.

NGK and DENSO are always preferred whichever was the OEM.