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Seth M.
Does this item fit a 2021 Jeep Wrangler Rubicon 4xe?

Yes, this will work on the 4xe.
Dan G.
Will this allow you to lock the lockers either in 4hi or 2nd

The Lynx Performance Locker Sensor Bypass Harness is primarily designed to address the issue of a faulty locker position sensor in Jeep Wrangler JL and Gladiator JT Rubicon models. When the sensor fails, it can prevent the lockers from engaging and trigger a "service axle locker" message.
This bypass harness works by simulating the signals from a functioning sensor to the Jeep's computer. This allows the computer to believe the lockers are operating correctly, even if the actual sensor is malfunctioning.
However, this harness does NOT change the factory limitations on when the lockers can be engaged. From the factory, the electronic lockers on the Jeep Wrangler JL Rubicon and Gladiator JT Rubicon are typically only enabled in 4Lo (4-Low).
Therefore, installing this bypass harness will NOT allow you to lock your lockers in 4Hi or 2Hi. It will only allow the lockers to function in the modes they were originally intended to work in, even with a faulty sensor.
Think of it this way: The harness fixes the communication issue caused by a bad sensor, but it doesn't reprogram the vehicle's software to allow locker engagement in different drive modes.
If you are looking to enable your lockers in 4Hi or 2Hi, you would need a different type of modification, such as an aftermarket locker control system or a programming change using a device like the Z Automotive Tazer JL/JT. These types of modifications actively override the factory locking logic.
This bypass harness works by simulating the signals from a functioning sensor to the Jeep's computer. This allows the computer to believe the lockers are operating correctly, even if the actual sensor is malfunctioning.
However, this harness does NOT change the factory limitations on when the lockers can be engaged. From the factory, the electronic lockers on the Jeep Wrangler JL Rubicon and Gladiator JT Rubicon are typically only enabled in 4Lo (4-Low).
Therefore, installing this bypass harness will NOT allow you to lock your lockers in 4Hi or 2Hi. It will only allow the lockers to function in the modes they were originally intended to work in, even with a faulty sensor.
Think of it this way: The harness fixes the communication issue caused by a bad sensor, but it doesn't reprogram the vehicle's software to allow locker engagement in different drive modes.
If you are looking to enable your lockers in 4Hi or 2Hi, you would need a different type of modification, such as an aftermarket locker control system or a programming change using a device like the Z Automotive Tazer JL/JT. These types of modifications actively override the factory locking logic.
Donald R.
Will this work on the 392 axle?

Yes, it will.
Ahmed A.
Does this item fit 2021 unlimited Rubicon

Yes, it does. Fits: 2018-24 Jeep JL Wrangler front and rear axles, 2020-24 Jeep JT Gladiator front and rear axles, 2020-24 Jeep JT Gladiator Mojave rear axle only.
Joshua H.
Will this also work on the rubicon? Is there a difference on these sensors?

Yes it will and there is no difference.