Code 43 is i think fuel supply system. what could this be? the car is driving fine so im confused.

 

Code 43 is most likely a problem with the oxygen sensor circuit.

If the Check Engine Light is on, with code 43 and there is poor drivability, then it may be due to a fuel supply issue. You are not experiencing poor drivability when the light comes on.

It may just be a lazy O2 sensor.

http://www.justanswer.com/uploads/ho...rd_code_43.pdf

 

I put a new O2 sensor on and the code cleared a day later. Thanks