Basemap?

[EFICU]

Yep, most likely the sensor is bad. Sorry man! See if you can grab a good sensor today and we can reinspect. There is a chance it's not the sensor, but in my experience it is. If you look in the image below, the first to graphs the AFR is dead flat at 13.69 and 13.97 for two revisions, then on the bottom it's rich at 11.84, that is before and after the new sensor, same tune. Gives you a visual of what I'm seeing, yours is doing the same thing at this point as the top two graphs there. When you get the new sensor in, put Rev01 back in and take it for a quick drive doing a pull from 3000-7000 rpms in third gear. Once we see we're back on track, we'll make a full length datalog and regroup.

Old-vs-New-Oxygen-Sensor.jpg

[Dinder]

Yep, most likely the sensor is bad. Sorry man! See if you can grab a good sensor today and we can reinspect. There is a chance it's not the sensor, but in my experience it is. If you look in the image below, the first to graphs the AFR is dead flat at 13.69 and 13.97 for two revisions, then on the bottom it's rich at 11.84, that is before and after the new sensor, same tune. Gives you a visual of what I'm seeing, yours is doing the same thing at this point as the top two graphs there. When you get the new sensor in, put Rev01 back in and take it for a quick drive doing a pull from 3000-7000 rpms in third gear. Once we see we're back on track, we'll make a full length datalog and regroup.

Old-vs-New-Oxygen-Sensor.jpg

Does Bosch work as a good OEM replacement? I've only ever used them in the past.

Edit - And you also mean upstream sensor as well correct?

[Dinder]

Yep, most likely the sensor is bad. Sorry man! See if you can grab a good sensor today and we can reinspect. There is a chance it's not the sensor, but in my experience it is. If you look in the image below, the first to graphs the AFR is dead flat at 13.69 and 13.97 for two revisions, then on the bottom it's rich at 11.84, that is before and after the new sensor, same tune. Gives you a visual of what I'm seeing, yours is doing the same thing at this point as the top two graphs there. When you get the new sensor in, put Rev01 back in and take it for a quick drive doing a pull from 3000-7000 rpms in third gear. Once we see we're back on track, we'll make a full length datalog and regroup.

Old-vs-New-Oxygen-Sensor.jpg

I'm not seeing any upstream sensors that are in stock currently, Ill have to order one from Rockauto it seems, should come in a couple of days and ill be sure to let you know when its installed.

[EFICU]

Yes I have had good luck with Bosch, so that works, we don't want Amazon stuff basically. One guy I helped sort the same issue had an Amazon one and he even acknowledged he made a mistake in doing that. So yeah, Bosch is fine, and yes the upstream, primary, whatever the parts store needs for info. We want the one that goes before the cat.

Okay no problem. For part throttle driving the sensor is working okay, it's just not reading your WOT fueling properly. So you can drive it, just don't do any spirited driving is all. Just keep the driving to a normal type driving without vtec engaging. You can keep Rev02 in there for now as that part throttle fueling is very good on that one. When you get the new sensor though, let me know and go back to Rev01 so we can make a third gear pull from 3000-7000 to inspect.

[Dinder]

Yes I have had good luck with Bosch, so that works, we don't want Amazon stuff basically. One guy I helped sort the same issue had an Amazon one and he even acknowledged he made a mistake in doing that. So yeah, Bosch is fine, and yes the upstream, primary, whatever the parts store needs for info. We want the one that goes before the cat.

Okay no problem. For part throttle driving the sensor is working okay, it's just not reading your WOT fueling properly. So you can drive it, just don't do any spirited driving is all. Just keep the driving to a normal type driving without vtec engaging. You can keep Rev02 in there for now as that part throttle fueling is very good on that one. When you get the new sensor though, let me know and go back to Rev01 so we can make a third gear pull from 3000-7000 to inspect.

Sounds good, ill try to get it ordered tonight, in the meantime, should I look for any other problems that could be causing this? The exhaust install went pretty smooth yesterday but I could check for some exhaust leaks, etc.

[EFICU]

Not really. The way the AFR is dead flat is very tough to do, so when it fails it makes that ultra flat AFR . If you had an exhaust leak, it would be up and down if anything. I would almost say this has been an issue for some time now and we are seeing it in the datalogs. Yours would be the fifth one now that has had this issue and been repaired by a new o2 sensor.

Which brand test pipe do you have on the car? How is the location of the primary o2 sensor, it doesn't have a defouler or anything installed that pushes the o2 sensor out of the stream like guys do on the rear o2?

[Dinder]

Not really. The way the AFR is dead flat is very tough to do, so when it fails it makes that ultra flat AFR . If you had an exhaust leak, it would be up and down if anything. I would almost say this has been an issue for some time now and we are seeing it in the datalogs. Yours would be the fifth one now that has had this issue and been repaired by a new o2 sensor.

Which brand test pipe do you have on the car? How is the location of the primary o2 sensor, it doesn't have a defouler or anything installed that pushes the o2 sensor out of the stream like guys do on the rear o2?

It's actually just a catback. It's got the stock catalytic converter, and to my knowledge of buying the car the O2 sensor has never been changed, (at 120k miles currently.)

[EFICU]

Gotcha, your original post said test pipe that's why I thought you had one. Yeah then I'm sure the O2 hasn't been tampered with. Could be the mileage as you say which makes sense then.

[Dinder]

Gotcha, your original post said test pipe that's why I thought you had one. Yeah then I'm sure the O2 hasn't been tampered with. Could be the mileage as you say which makes sense then.

Yeah, that was my original plan until I was able to get my hands on a barely used Q300 for $200, haha, I'm just about to order the sensor, gonna pay the extra $12 just so it'll come on the 18th rather than the 22nd, Ill let you know when its all bolted up and ready!

[EFICU]

Sounds good. Hopefully we're back on track once it goes in. I'll keep an eye out for your update.

[Dinder]

Sounds good. Hopefully we're back on track once it goes in. I'll keep an eye out for your update.

The package should have been delivered today but it's currently saying it's pending lol, gonna give em a call but if it might end up being delivered tomorrow.

[EFICU]

The suspense, haha! Okay, hopefully they can get it tomorrow then or something. Keep me in the loop.

[Dinder]

The suspense, haha! Okay, hopefully they can get it tomorrow then or something. Keep me in the loop.

Package is still pending lol, hopefully either comes by tonight or Monday now I guess, calling them did absolutely nothing aswell hahaha.

[EFICU]

This is why only car people should be allowed to deliver and transport packages, only they understand the impact on our lives! Haha.

Okay, just keep me in the loop. We'll let the slackers get it to you whenever they can.

[Dinder]

This is why only car people should be allowed to deliver and transport packages, only they understand the impact on our lives! Haha.

Okay, just keep me in the loop. We'll let the slackers get it to you whenever they can.

Finally out for delivery right now, i’ll respond back with a new Rev02 data log!