My car was dyno tuned professsionally back in august of this year. Car is a n/a gsr motor running a p28 with hondata s300. Anyway car ran fine intill I got a check engine light for code 1. My wideband is wired up to the s300 to pin 15 the eld pin on the ecu. I can't figure out why I would be getting a code 1 for oxygen sensor #1? Sence than car has been running rich, and I didn't get the code all the time. Every time it has been diffrent driving cases. Just crusing I got it, wot I got it and just idleing I got it and this was over a 3 week period. Every time I have gotten the code I removed the ecu and backup fuse. I have also removed the o2 signal wire from the ecu. I haven't gotten the code yet but can't understand why I would be getting this code. Is it possable the the ecu is bad? Why is it running rich? Nothing in the car has changed and I haven't messed with anything with the s300. The only thing that has changed is the gas formula because I live in pa. Don't they run a higher oxygen content gas in the winter that would cause the car to run leaner? The person who tuned this car is as baffled as I am.

 

Disable the O2 sensor within the software and run open loop if you are already tuned with the wideband.

 

I am sure thats what the person who tuned my car did. Was disabled the o2 sensor. I don't have much experience with the s300 software. I have messed with the software a little, but nothing on a live car.

 

How are you checking your codes?

Via the smanager software or via the service jumper?
If you are checking the codes via the service jumper, make sure you are not confusing code 1 (quick single flash) with a code 10 (long single flash).
Code 10 = intake air temperature sensor which can cause the tune to be thrown off if it's not properly working.

 

I was checking codes with smanager software. Thats all I would do with the s300.

 

Open your calibration file.
Under parameters / closed loop what boxes are checked?

 

closed loop operation, disable o2 heater. is what boxes are checked under the options tab.

 

If your tuner properly configured the wideband input to be used for closed loop operation he should have checked: "Use wideband for closed loop operation"

He should have also setup the wideband target voltage in closed loop & Short term fuel trims etc.

 

Is this something that I can do myself? I see what you are talking about, I can't understand why he doesn't have that option enabled. I do have my wideband eld pin 10 I think it is. Or is this something he should have done while on the dyno?