Parts Guide
GRILLE Audi A4 · PARTS GUIDE

Audi A4 Grille: Fitment, Sensors & Common Damage

A genuinely money-saving finding: the ACC radar sensor has an internal heater unit that can fail separately from the sensor itself, resolved by replacing just this part for under £250 — plus a clarification that a misalignment fault code doesn't always mean a new sensor is needed.

Illustration of a front grille Illustration for editorial purposes

OEM Part Numbers

Accuracy note: genuinely worth knowing: front parking sensors are sometimes housed in the lower grille section on the A4 rather than the bumper itself — check where your sensors actually sit before ordering a grille, since a sensor-less part won't have the correct cutouts.

Cosmetic on the Surface, Functional Underneath

The front grille does more than shape a car's face — it manages airflow to the radiator and, on many modern cars, houses or surrounds sensors for adaptive cruise control or parking assistance, meaning the correct part depends on more than just how it looks.

Before you buy: grille design varies significantly by trim, and higher trims may integrate radar or camera sensors behind or within the grille itself. Always confirm against your VIN before ordering.

What It Does

Beyond styling, the grille on the A4 directs airflow to the radiator and, on trims equipped with adaptive cruise control, may house or sit directly in front of the radar sensor used for that system. A grille that looks compatible but lacks the correct sensor cutout can interfere with these systems even if it fits physically.

Audi A4 Grille reference plate

Generations, Derivatives & Grille Finish

Standard trimsSingle-frame grille with chrome-trimmed slats, not honeycomb
S4Genuine honeycomb mesh design distinct from standard trim, typically with a chrome or gloss black frame depending on model year — S-Line bumper trim is required for the honeycomb style to fit correctly
RS4Same honeycomb mesh style as S4 but with a more aggressive black frame — the two share styling DNA but RS4's grille aperture and lower mesh section are genuinely different from S4's

Shop for This Part on eBay

Honeycomb Grill for Audi A4 / S4 B9 2016-2019 Prefacelift Grille Gloss Black OEM Honeycomb Grill for Audi A4 / S4 B9 2016-2019 Prefacelift Grille Gloss Black OEM GBP 129.99 Front Honeycomb Mesh Grille For Audi A4 S4 B8.5 2012-2015 Facelift Gloss Black Front Honeycomb Mesh Grille For Audi A4 S4 B8.5 2012-2015 Facelift Gloss Black GBP 135.00 For Audi A4 S4 B9 Gloss Black RS4 Style Honeycomb Mesh Front Grill Grille 17-19 For Audi A4 S4 B9 Gloss Black RS4 Style Honeycomb Mesh Front Grill Grille 17-19 GBP 59.99 RS Style Gloss Black Honeycomb Front Grille for Audi A4 B8 2012-2015 Mesh Grill RS Style Gloss Black Honeycomb Front Grille for Audi A4 B8 2012-2015 Mesh Grill GBP 130.00 FOR AUDI A4 B9 RS4 STYLE GLOSS BLACK HONEYCOMB FRONT GRILLE W/FOG GRILLE 2017-19 FOR AUDI A4 B9 RS4 STYLE GLOSS BLACK HONEYCOMB FRONT GRILLE W/FOG GRILLE 2017-19 GBP 149.98 RS4 Style Gloss Black Honeycomb Mesh Bumper Grille For Audi A4 S4 B8 2009-2012 RS4 Style Gloss Black Honeycomb Mesh Bumper Grille For Audi A4 S4 B8 2009-2012 GBP 79.98 For Audi A4 S4 B8 Gloss Black RS4 Style Honeycomb Mesh Front Grill Grille 08-12 For Audi A4 S4 B8 Gloss Black RS4 Style Honeycomb Mesh Front Grill Grille 08-12 GBP 59.99 S Look Front Grille Gloss Black for Audi A4 S4 B8.5 Facelift 13-15 S Line S Look Front Grille Gloss Black for Audi A4 S4 B8.5 Facelift 13-15 S Line GBP 120.00

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A Genuinely Money-Saving, Real Finding Worth Knowing — Audi A4 Grille

If the adaptive cruise control has become unavailable, this is genuinely worth knowing before assuming the whole radar sensor needs replacing: the sensor contains an internal heater unit, and one documented case saw this specific heater fail on its own, causing the ACC to stop working, while the main sensor itself remained fine. Replacing just the heater unit, which simply unclips from the grille, resolved the fault entirely for just under £250 including both the part and labour — genuinely worth asking a specialist whether just this component can be replaced rather than the entire sensor assembly.

A genuinely important clarification worth knowing about fault codes: a specific diagnostic code referring to the sensor being misadjusted or incorrectly positioned does not automatically mean a new sensor is required — it may simply need proper recalibration by a dealer, which is considerably cheaper than a full replacement. It's also worth knowing that removing the front bumper for entirely unrelated work, such as an LED headlight upgrade, has been documented damaging the radar units or their wiring in the process, worth being aware of this risk and having the radar system checked afterward if any bumper-off work has been carried out.

It's also genuinely worth knowing a reassuring, real account: a professional cleaning of the radar sensor alone, without any parts replaced, has been documented resolving cascading failures across multiple driving assistance systems for a modest cost, remaining stable for over six months afterward — worth trying a thorough clean and recalibration first before assuming a genuine hardware fault.

Common Damage, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Grille Guide for common damage types, confirming trim-specific fitment, how difficult this job is to DIY, and the ADAS calibration risk with sensor-equipped grilles.

More Audi Grille

The same part, covered across other Audi models.