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2018 Honda Accord 2.0T
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After installing the dp, I used my ktuner to turn off the emissions error. The error went away, but now it is back. Should I flash my ecu again and see if it takes and stays off? Thanks for your help.
 

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Flashing it will do nothing if it's throwing an mechanical issue it will just come back after it adapts. Also are you sure it's an emissons error? You have a two year old car as well. It's highly possible you need a new o2 sensor
 

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You have a two year old car as well. It's highly possible you need a new o2 sensor
Wow... I would hope an O2 sensor in our cars would last more than 2 years. I have a twenty year old SUV and just recently had to replace my first O2 sensor.
 

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Wow... I would hope an O2 sensor in our cars would last more than 2 years. I have a twenty year old SUV and just recently had to replace my first O2 sensor.
Yes I had one go on my gti under similar circumstances. Code came back on even with o2 spacer after a little bit, sensor was bad. Especially so with and aftermarket dp that flows more, in my case I had no primary cat. If the tuner did it right they don't just shut the sensor off which is the quick easy way to do it. They program it out to fool the sensor there is a flow variation so the sensor still functions properly. Previously you don't need any programming at all just a spacer but not sure with some of the newer cars if they have gotten smarter.
 

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Maybe double check that everything was reinstalled/reattached properly? I have Hondata and on mine, IIRC, I had to go into a sub-menu and uncheck a box to take the O2 sensor out of the loop before reflashing...
 

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Yes I had one go on my gti under similar circumstances. Code came back on even with o2 spacer after a little bit, sensor was bad. Especially so with and aftermarket dp that flows more, in my case I had no primary cat. If the tuner did it right they don't just shut the sensor off which is the quick easy way to do it. They program it out to fool the sensor there is a flow variation so the sensor still functions properly. Previously you don't need any programming at all just a spacer but not sure with some of the newer cars if they have gotten smarter.
If I understand you correctly the sensor going bad is related to the aftermarket tuner... under normal operation/staying within the OEM setting they should last longer?
 

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Dunno, I think you'd have to talk to Doug/Hondata - it seems like they are just telling the ECU to ignore the O2 sensor readings?
It could be that's why I asked. If not that could explain the code. The op still hasn't answered if he scanned the vehicle to confirm the code yet either.
If I understand you correctly the sensor going bad is related to the aftermarket tuner... under normal operation/staying within the OEM setting they should last longer?
No more the aftermarket high flow do with or without cat that would cause the code in the first place. All that extra particulate is passing over those sensors now.
 
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