2016-2018 Acura ILX Grille: Decoding AcuraWatch Variants and Replacement Costs

Grille Variants for the 2016-2018 Acura ILX

When replacing the grille on a 2016-2018 Acura ILX, the single most important factor is determining if the vehicle is equipped with the AcuraWatch™ suite of safety features. This option dictates which grille is compatible. Installing the wrong grille can lead to the failure of the Adaptive Cruise Control (ACC) and Collision Mitigation Braking System™ (CMBS).

1. Grille for Models WITH AcuraWatch™ (Adaptive Cruise)

Vehicles with AcuraWatch™ use a specific grille that features a solid, smooth panel integrated into the center where the Acura emblem is mounted. This panel looks like a dark, glossy plate and is designed to be transparent to radar waves, allowing the millimeter-wave radar unit mounted behind it to function correctly. Using a grille without this specific panel on an AcuraWatch™-equipped car will block the radar sensor, triggering warning lights on the dash and disabling the safety systems.

• Key Identifier: Solid, flat panel behind the Acura emblem.
• Common OEM Part Number: 71121-TX6-A21

2. Grille for Models WITHOUT AcuraWatch™ (Base/Standard Models)

The standard grille for ILX models without AcuraWatch™ has an open, slatted design behind the emblem, similar to the rest of the grille's pattern. Air can pass freely through this area. This grille is not compatible with AcuraWatch™ vehicles because it does not provide the proper housing or protection for the radar sensor.

• Key Identifier: Open, mesh or slatted pattern visible behind the Acura emblem.
• Common OEM Part Number: 71121-TX6-A51

Symptoms of a Damaged or Failing Grille

Grille failure is almost always due to physical damage. Here’s what to look for:

• Visible Cracks and Holes: Impacts from road debris, animals, or minor parking lot bumps are the most common cause of damage. Even small cracks can compromise the grille's structural integrity.
• Broken Mounting Tabs: The plastic tabs that secure the grille to the bumper cover are fragile. If they break, the grille can become loose, rattle, or sit misaligned.
• Peeling or Faded Finish: The chrome or painted finish can chip, peel, or fade over time due to sun exposure and debris, affecting the vehicle's appearance.
• ACC or CMBS Warning Lights: On AcuraWatch™ models, any damage, misalignment, or even a blockage (like heavy snow or ice) of the grille's center panel can interfere with the radar sensor and trigger a system error message on the dashboard.
• Engine Overheating: In extreme cases, a grille that is heavily clogged with leaves, plastic bags, or other debris can restrict airflow to the radiator and cause the engine to run hotter than normal, though this is rare.

Buying a Used 2016-2018 ILX Grille

A used OEM grille is often a better choice than a cheap aftermarket alternative because it guarantees correct fitment, material quality, and proper sensor compatibility. However, careful inspection is key before buying.

What to Inspect:

1. Verify the AcuraWatch Compatibility: This is the first and most important step. Look at the area behind the emblem. If it's a solid, flat panel, it's for a car with AcuraWatch™. If it's open mesh, it's for a base model. Do not trust a listing's description alone—always verify with photos.
2. Check All Mounting Tabs: Flip the grille over and inspect every single mounting tab and clip location. Even one broken tab can cause a poor fit or a rattle. This is the most common reason a used grille is unusable.
3. Look for Hairline Cracks: Carefully inspect the entire surface, especially around the emblem and at the corners, for small cracks that might not be obvious at first glance.
4. Inspect the Radar Panel (AcuraWatch™ Models): On a grille for AcuraWatch™ models, ensure the solid center panel has no deep scratches, cracks, or delamination. Such damage could potentially interfere with the radar signal.
5. Assess the Finish: Check for deep pitting, peeling chrome, or heavy fading. Minor scuffs from normal use are acceptable, but significant cosmetic damage may be difficult to repair.

Recalls and Technical Service Bulletins (TSBs)

As of mid-2026, there are no specific recalls or TSBs issued by Acura or the NHTSA for the grille assembly on the 2016-2018 Acura ILX. However, several important safety recalls exist for this vehicle concerning other components, including the brake master cylinder, fuel pump, and driveshafts. Owners should check their Vehicle Identification Number (VIN) on the NHTSA website to ensure all applicable recalls have been addressed.

Replacement Information

Replacing the grille on a 2016-2018 ILX requires removing the entire front bumper cover. This makes it a moderately involved task.

• Difficulty: 3 out of 5
• Estimated Time: 1.5 - 2.5 hours
• Tools Required: Socket set, screwdrivers (Phillips and flathead), trim removal tools, and potentially a blanket to place the bumper on to prevent scratches.

Replacement Steps Overview:

1. Open the hood and remove the plastic clips and bolts securing the top of the bumper cover.
2. Remove the screws from each front wheel well that attach the bumper to the fenders.
3. Remove the clips and screws along the bottom edge of the bumper cover.
4. Carefully unsnap the bumper cover from the retaining brackets under the headlights on both sides and pull it forward. If equipped with fog lights, disconnect the electrical connectors before fully removing the bumper.
5. With the bumper cover removed and placed on a soft surface, you can access the screws and clips holding the grille in place from the back.
6. Unscrew the old grille and transfer any necessary parts (like the emblem or chrome moldings, if not included with the replacement) to the new grille.
7. Install the new grille and reverse the steps to reinstall the bumper cover.

AcuraWatch™ Radar Calibration

Cost Comparison

Prices for the main upper grille can vary significantly based on the source and type. Labor for installation typically involves 1.5-2.5 hours of shop time.

Frequently Asked Questions (FAQ)