When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Dyna Glide ModelsSuper Glide, Super Glide Sport, Super Glide Custom, Dyna Glide Convertible, Super Glide T-Sport, Dyna Glide Police, Dyna Switchback, Low Rider, Street Bob, Fat Bob and Wide Glide.
I've got a 2016 FXDLS 110 cubes. I got this bike with 19k on it. This bike was performance moded by the previous owner, and "returned to stock" before I bought it.
I took the stock exhaust off and installed a Bassani 2 into 1, so I will need a tune. Before getting a tune, I wanted to replace the O2 sensors, for good measure. I replaced the rear sensor no problem. As I'm looking at the wire routing for the front sensor, I notice it plugs into the harness just below the horn. Out of curiosity, I traced the harness wire back and up under the seat where I found it simply plugged off with a plastic cap. To confirm I traced the correct wires, I did a continuity test. Yep that's correct. The front O2 sensor is simply capped off with a plastic cap. See photo. I don't see a a vacant receiving end anywhere that it should be plugged in to.
Why would this be? Would it be something the factory did? Or, during performance mods.... did the previous owner do this? Either way, I find it hard to believe that any computer controlled bike wouldn't want to read the front cylinder. Thoughts?
Last edited by Detroit Iron; Feb 22, 2025 at 04:52 PM.
It does appear this tuner has two sensors. I just don't see where the factory second sensor plug is.
If that is in fact what is on your bike, that is not a tuner, per say, it is a replacement ECM for the OEM ECM. It has it's own O2 sensors, and doesn't use the OEM O2 sensors or O2 sensor wiring. It is customer programable, so it's basically a new ECM that you can then tune easily. If you have that ECM, get the manual from Thundermax. Read about what it can do. Read the install portion, and it will tell you what and where OEM O2 sensors will be unplugged and/or capped.
An actual "tuner" is either a piggyback style tuner or a flash tuner.
A piggyback tuner plugs between the original ECM and the sensors, and it fools the ECM into making changes to the bike's tune.
A Flash tuner connects to the bike via the data port. It can then read and write to the OEM ECM. It can adjust or totally replace the OEM tune, and other parameters. Then it is disconnected and your bike works off the OEM ECM and sensors, with the changes that were made to tune.
The drift I'm getting is this didn't come with the Thundermax tuner the PO used, OP is that the skinny?
I use a PV and haven't ever used the Thundermax so I don't know if it permanently owns the ECM like the PV....so I wonder if it's possible to now use a PV on it?
Also, was the exhaust the only thing the PO did or does it have a different cam than the stocker?
The drift I'm getting is this didn't come with the Thundermax tuner the PO used, OP is that the skinny?
Also, was the exhaust the only thing the PO did or does it have a different cam than the stocker?
Yes you got it. The bike had a Thundermax and now has the stock ECM, but at this point it's irrelevant. My main issue is that there is no where to plug in the front O2 sensor. It's just bizzare.
Today I had the battery out, and I pulled the ECM and the entire wiring harness out. It's as if this bike came with the provision to plug in only one O2 sensor. Maybe the FXDLS came this way. I don't know.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.
2016 O2 Sensors
