Hey so I was driving home and the cel popped on last week I didn’t think much of it because the drivability wasn’t affected. Anyways it’s still on so I pulled it and it’s code 43 fuel supply. The only thing I can think of is that I’m running no exhaust just a test pipe but even that is a slim chance? I just want the damn light off lol it’s a b16 eg

 

Oh and I swapped out the gas cap still no dice

 

Bump?

 

Busters

 

I think the code 43 means running too lean. Based on oxygen sensor readings, the ECU tried to trim the mixture richer, but reached the limit of how far it will go. This could be low fuel pressure or one or more clogged injectors, or another sensor reading (eg the IAT) out of line.

 

Would running the car open header harm the o2 making it do this? Car drove fine ever since I had it and starting acting funny since open header. 900-600rpm idle drops and the intermittent cel is all the symptoms I’m experiencing.

Basically should i try to replace the o2 sensor and get a exhaust, or look towards fuel, because no exhaust is not causing it?

 

Why are you running open header?

 

what ecu is running it? check the o2, and if you havent in awhile, replace the fuel filter.

 

Because the previous owner got a aftermarket exhaust for the wrong car, I found this out when it started dragging from the mid pipe on the freeway. So I deleted it.

Nope have no idea if it’s been changed but I’ll go ahead and do that too. Running stock p30 ecu.

Idk nobody thinks that since I ran it open header and especially at this time of year condensation coming out of the test pipe at 38 degree temps, fried my o2 making it misread like that?

 

You're saying you have a header, attached to a test pipe, and then it just ends under the car with nothing after that? I would not expect it to run very well. It's only making you think it is fast because it is so loud.

And yes the ECU will get bad readings from the O2 because air can get in the open end of the pipe, bringing extra oxygen. It would be like the stock OBDII DX manifolds when they crack and let air in. This would likely be a temporary situation rather than permanent damage to the sensor.