It started throwing code 1 and 43. sunday nite and since, it was bad noticed symtoms light and intermittenly. it hesitates a good bit unless full throttle is applied. replaced 02 a few weeks ago. plugged in and has power to the proper places.

stock d16z6- no add ons except for integra cluster working fully and properly.

 

no one has ever encountered this code?

 

If you unplug the O2 sensor, does the engine run better?

Have you tested the O2 sensor wires?

Have you replaced the fuel filter, measured the fuel pressure, and tested the FPR?

 

no to the FPR. yes to all above.

 

i dont believe it is Fuel supply. it has a sputter below 80% throttle. throws code 1 and 43 from the start.

 

Does to the engine runs better with the O2 sensor unplugged?

How did you test the O2 sensor wires? Which ones?

Don't guess. Check the FPR. What were the fuel pressures with and without the FPR vacuum hose connected?

Also check the fuel injectors.

 

no, the engine does not run better. it turned out to be the filter, junk in the gas tank, and the sock filter over the pickup. lack of fuel supply.

the injectors werre new (3 of them, 1 tested good).