2024-2026 Honda Prologue Fog Light: Trim Levels, Part Numbers, and Replacement
This guide covers the LED fog lights found on Touring and Elite trims, including how to diagnose failures and what to look for when buying a used assembly.
- These fog lights are only compatible with 2024-2026 Honda Prologue Touring and Elite trims; they cannot be easily added to a base EX model.
- The OEM part number is 85551764, which is a universal part that fits both the driver and passenger sides.
- This is a sealed LED assembly. You cannot replace just the bulb; the entire unit must be replaced if it fails.
- Replacement requires accessing the back of the front bumper, which may involve removing the fender liner and potentially the bumper cover itself.
Vehicle Fitment and Trim Level Exclusions
The LED fog lights are standard equipment exclusively on the 2024-2026 Honda Prologue Touring and Elite trim levels. The base EX trim does not come equipped with fog lights from the factory and has blank covers in the bumper where the lights would be mounted.
Compatibility Warning: You cannot add factory fog lights to a Prologue EX model by simply buying the lamp assemblies. The EX trim lacks the necessary wiring harness, dashboard switch, and potentially the required software programming in the vehicle's body control module to operate the lights. A retrofit would be a complex and costly custom job.
Known Issues, Recalls, and Technical Service Bulletins (TSBs)
As of mid-2026, the Honda Prologue is a relatively new vehicle platform. Consequently, there are no widespread reported problems, recalls, or Technical Service Bulletins (TSBs) issued by Honda specifically for the fog light assemblies. While some early recalls have been issued for the Prologue, such as for a potential front lower control link issue (NHTSA Campaign ID: 24V-540) on a very limited number of vehicles, none are related to the lighting system.
Common Symptoms of a Failing Fog Light
The 2024-2026 Prologue uses a sealed LED fog light assembly, meaning you cannot replace a simple bulb. When a problem occurs, it's typically with the entire unit or the electrical circuit supplying it.
- One or Both Fog Lights Do Not Turn On: This is the most obvious symptom. If both lights are out, the first thing to check is the fuse for the fog light circuit. If only one is out, the problem is likely the lamp assembly itself, as it contains the integrated LED and driver module.
- Flickering or Strobing Light: An LED fog light that flickers or pulses can indicate a failing internal driver module within the lamp assembly. It can also be a sign of a poor electrical connection or a problem with the vehicle's wiring.
- Dim Light Output: If a fog light appears significantly dimmer than the other, it often points to a failure of the LEDs or the internal electronics within the sealed unit. This is not repairable; the assembly must be replaced.
Buying a Used Fog Light: What to Inspect
Since the Prologue fog light is a single, universal part for both sides, finding a used one is straightforward. A high-quality used OEM part can offer significant savings over a new dealer part. Here’s what to look for:
- Confirm the Part Number: The correct OEM part number is 85551764. This single part number fits both the driver (left) and passenger (right) side of the vehicle.
- Inspect the Lens: Look for deep scratches, rock chips, or cracks. While minor scuffs can be polished, any crack will allow moisture in, leading to premature failure. Check for hazing or yellowing from UV damage, though this is less common on newer vehicles.
- Check for Internal Moisture: Carefully examine the inside of the lens for any signs of condensation, water droplets, or a tide line from standing water. A compromised seal means the internal electronics are exposed to corrosion and will fail. Do not buy a light with moisture inside.
- Verify All Mounting Tabs are Intact: The assembly is held in place by several plastic mounting tabs. During a collision or improper removal, these tabs can easily break. A light with broken tabs will not mount securely, leading to vibration and improper aim. Insist on seeing clear photos of all mounting points before buying.
- Examine the Electrical Connector: Ensure the plastic connector housing is not cracked or broken and that the electrical pins inside are not corroded or bent. The wiring pigtail should be intact and not cut short.
Replacement Overview
Replacing the fog light on a Honda Prologue typically requires accessing the back of the front bumper cover. While official instructions for the Prologue are not widely available, the general procedure for modern Hondas involves these steps:
- Disconnect the vehicle's 12V battery.
- Remove several plastic clips and screws holding the front portion of the fender liner and the engine splash shield.
- Peel back the fender liner to create enough space to reach behind the bumper. In some cases, partial or full removal of the front bumper cover may be necessary for easier access.
- Unplug the electrical connector from the back of the fog light assembly.
- Unscrew the two or three screws holding the assembly to the bumper.
- Install the new light and follow the steps in reverse.
Pro Tip: After installation, it is important to check and adjust the fog light aim. Park the vehicle on a level surface facing a wall 25 feet away. The top of the fog light beam's cutoff should be at or slightly below the height of the center of the fog light lens. The adjustment is typically done via a small screw on the back of the assembly.
Cost Comparison
Prices can vary based on supplier and condition. The following is an estimated cost breakdown:
| Part Type | Estimated Cost |
|---|---|
| New OEM (Dealer) | $80 - $120 |
| New Aftermarket | Not widely available as of 2026 |
| Used OEM | $50 - $90 |
| Shop Labor for Replacement | $120 - $270 |
Frequently Asked Questions (FAQ)
Is this fog light for the driver or passenger side?
The Honda Prologue fog light assembly, part number 85551764, is universal and fits both the driver's (left) and passenger's (right) side of the vehicle.
Can I replace just the bulb in my fog light?
No. The 2024-2026 Honda Prologue uses a fully integrated LED fog light assembly. The light source is a sealed, non-serviceable unit. If the light stops working, the entire assembly must be replaced.
Can I install these fog lights on my Prologue EX?
No, this is not a simple plug-and-play upgrade. The base EX trim lacks the specific wiring harness, relay, and switch needed to power the fog lights. Adding them would require extensive and expensive custom electrical work.
Does the fog light require aiming after installation?
Yes, it is highly recommended to check and adjust the aim after replacing a fog light. Improper aiming can either blind oncoming drivers or fail to illuminate the road correctly, defeating the purpose of the light.
Technical Specifications
OEM Part Numbers: 85551764
Bulb Type: Integrated LED. Universal Fitment: Fits both driver (left) and passenger (right) side.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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