2012 WG, had Fairbault HD install a Mastertune2 and dyno motor.
I had a auto tune power commander in the bike and didn't care for it.

I just got a P0051 FC and found the rear O2 sensor loose, it won't tighten though.
Front sensor is the same, it just threads right on though the bung on the Rineheart 2 into 1 pipes.

It is not the OEM sensor best I can tell and I believe it might be a wide band sensor.
I think they came with the Commander ecm kit?
The only thing on these sensors is OSM or WSO, depending on which way you look at it.

I had it dyno tuned with these sensors in it, so my question is..
Can I use the stock narrow band sensors and will it need to be re tuned if I do?

The guy who did the tuning is gone till later next week, hoping to get bike back up and running before that.

TIA

Al

 

There are 2 sizes of sensors. 18mm and 12mm.
A 12mm sensor will fall through an 18mm bung.
Maybe they are stripped from galling which happens when a sensor is removed without antiseize used when installed?
Bob

 

Here's a picture of what is in the bike, doesn't look like what I can find the OEM sensors look like.

Al

 

There is an adapter on that sensor.
The adapter has no flange or lip to seat against the bung in the pipe.
Get a set of adapters with flanges to keep the adapter from screwing all the way into the pipe.
That's the first time I've seen flangeless adapters. Maybe homemade?

 

Best guess is they came with the Power commander kit I first installed.

Not sure what they looked like when new, been to long ago, or if possibly the dealer modified them.

Problem I have is whether they are narrow or wide band and if I can replace them with something that fits??

Al

 

Just get the correct adapters and you're good to go.
BYW Thise are narrow band OEM 12mm O2 sensors.

 

The plot thickens..

Did find there was a adapter on the sensor, also when I use one of the adapters I got way back, it looks like I'm going to have a problem with the sensor not going far enough into the bung to get a good reading?

The adapters I have are from Drag Specialties, I see Rineheart has them too, hoping they may be a bit thinner?

I'm wondering if they make 18mm sensors in the narrow band?

Thanks, again.
Al

 

Ok, did find out they are narrow band OEM sensors.

Supposedly the narrow band 18mm sensors are different that the stock 12mm HD sensors so I can't just use them.

If that's correct, looks like I have to remove the 18mm bungs and weld in 12mm ones.

Not sure, but I doubt I can use the wide band 18mm ones either.

Al

 

Since the adapters you have are flangeless I assume someone cut off the flange to get them into the pipe further.
Problem is...how do you keep the adapter from screwing in or out since there's nothing to stop it?
I would highly recommend you get 12mm bungs welded into your pipe.
That will eliminate all the unnecessary issues with adapters and sensor depth.
Bob

 

That may happen, but three people (Rinehart/Revolution Performance/Dynojet have said to run the sensors with the adapters, only the dealer that did the grinding on the original adapters says not to.

Since our summers are so short (Minn) I'm going with the adapters and perchance it doesn't work I can redo the bungs this winter, thanks.

Al