Audi Allroad Underbody Protection Guide: A4 and A6 Models (2000–2026)

Audi Allroad models combine increased ground clearance and quattro all-wheel drive with the comfort and road behaviour of an estate car. However, additional ground clearance does not automatically protect the engine, radiator, gearbox or other exposed components underneath the vehicle.

A deep pothole, compacted snow, loose stone, damaged road surface or raised section between the wheel tracks can still reach vulnerable parts of the underbody. Installing the correct Audi Allroad skid plate creates a physical barrier between these components and objects approaching from below.

This guide compares the underbody protection available for Audi A4 Allroad and Audi A6 Allroad models from 2000 to 2026. The current range includes vehicle-specific 2 mm steel protection for the engine, lower front-bumper area, radiator and gearbox.

Browse all available products in the Audi Allroad underbody protection category.

Which Audi Allroad components need protection?

The most important protection zones depend on the vehicle generation, engine, transmission and existing factory underbody layout.

• Engine and oil sump: Located near the front underside of the vehicle and vulnerable to direct contact with pothole edges, stones, frozen snow and uneven ground.
• Radiator and lower cooling area: Can be exposed to frontal contact with stones, branches, compacted snow and raised road debris.
• Front bumper area: Protection can help create a more continuous barrier beneath the front of the vehicle.
• Gearbox: Remains vulnerable after the front wheels have crossed an obstacle, particularly when driving over deep ruts or raised sections between the wheel tracks.

Protecting only the engine does not necessarily protect the gearbox. These components occupy different sections of the underbody, and some Audi Allroad applications use separate plates for the front and centre protection zones.

For a broader explanation, read our engine skid plate vs full underbody protection guide.

Audi A6 Allroad C5 protection: 2000–2005

The first-generation Audi A6 Allroad in the current catalogue has separate protection options for the engine and front cooling area and for the gearbox.

The Audi A6 Allroad 2000–2005 engine, front bumper and radiator skid plate is made from 2 mm steel and is listed for the 2.5 TDI application. This version includes an oil-sump service opening.

Separate gearbox protection is available for the same generation:

• Audi A6 Allroad 2000–2005 automatic gearbox skid plate
• Audi A6 Allroad 2000–2005 gearbox skid plate

The catalogue states that the gearbox protection is installed together with the required engine protection. Check the selected product and installation arrangement before ordering individual sections.

Audi A4 B7 Allroad protection: 2005–2008

For Audi A4 B7 All Road models from 2005 to 2008, the available front skid plate protects the engine, lower front-bumper area and radiator.

The Audi A4 B7 2005–2008 engine, front bumper and radiator skid plate is made from 2 mm steel. Listed engine applications include 1.6, 1.8, 2.0, 1.9 TDI, 2.0 TDI and 3.0 TDI variants.

Transmission protection must be selected according to the gearbox type:

• Automatic gearbox skid plate
• Manual gearbox skid plate

The manual and automatic versions should not be treated as interchangeable. Confirm the transmission type from the VIN and vehicle documentation before selecting the gearbox plate.

Audi A4 B8 Allroad protection: 2008–2014

Audi A4 B8 Allroad models have separate front protection variants for petrol and diesel applications.

Available options include:

• Audi A4 B8 Allroad diesel engine, front bumper and radiator skid plate
• Audi A4 B8 Allroad petrol engine, front bumper and radiator skid plate
• Audi A4 B8 Allroad gearbox skid plate

The petrol and diesel front plates should be matched to the vehicle’s exact engine and underbody configuration. A product listed for the correct model year may still differ in mounting layout, exhaust clearance or service access between powertrain variants.

Audi A6 Allroad protection: 2005–2011

The catalogue contains two combined protection versions for Audi A6 Allroad models from 2005 to 2011.

Both are made from 2 mm steel and are designed to protect the engine, front bumper, gearbox and radiator areas:

• Audi A6 Allroad 2005–2011 protection with lateral sections
• Audi A6 Allroad 2005–2011 protection without lateral sections

Do not select between these versions based only on the model year. The existing underbody arrangement and the required side-section configuration must also be checked before ordering.

Audi A6 Allroad protection: 2011–2018

For Audi A6 Allroad models from 2011 to 2018, the current range separates front protection from gearbox protection.

The Audi A6 Allroad 2011–2018 engine and radiator skid plate protects the main front underbody zone.

A separate Audi A6 Allroad 2011–2018 gearbox skid plate extends protection towards the centre of the vehicle.

Installing both sections provides broader coverage than using the engine plate alone. This can be particularly relevant when driving on broken rural roads, gravel routes, winter-damaged surfaces or tracks with a raised centre section.

Audi A4 B9 Allroad protection: 2015–2026

The latest Audi A4 B9 All Road application in the catalogue covers model years 2015 to 2026.

The Audi A4 B9 All Road engine and radiator skid plate is made from 2 mm steel and is listed for all engine variants. Product weight is 9 kg.

Separate Audi A4 B9 All Road gearbox protection is also available. The gearbox plate is listed at 7 kg, and the product page states that the engine skid plate is required for installation.

This means buyers planning complete front and centre protection should check both products as a combined installation rather than treating the gearbox plate as an independent front mounting system.

Engine protection or engine and gearbox protection?

An engine skid plate is usually the first priority because the oil sump and lower engine area are positioned near the front underside of the vehicle. However, the gearbox remains exposed farther back.

Engine-only protection may be sufficient when:

• the vehicle is mainly used on maintained roads;
• the most likely hazard is frontal contact with pothole edges or loose road debris;
• the selected product already covers the required radiator or lower bumper area.

Adding gearbox protection becomes more relevant when:

• the vehicle regularly travels on gravel or damaged rural roads;
• deep ruts or raised centre sections are common;
• the vehicle is used in winter conditions with compacted snow and frozen road edges;
• broader front-to-centre underbody coverage is required.

If gravel roads are a regular part of your driving, see our guide to underbody protection for gravel roads to identify which components should be protected first.

Learn more in our gearbox skid plate guide.

Why use 2 mm steel protection?

All Audi Allroad protection currently listed in this category is made from 2 mm steel.

Steel is commonly selected where resistance to repeated or concentrated impacts is a priority. The final strength of a protection system depends not only on material thickness but also on the plate geometry, reinforcement, mounting design and protected area.

Powder-coated steel requires periodic inspection. After an impact or winter use, check the surface for damaged coating, deformation and exposed metal. Clean away accumulated mud and road salt, and repair damaged coating where necessary to preserve corrosion protection.

For a general material comparison, read our steel vs aluminium skid plate guide.

Installation and service access

The listed Audi Allroad skid plates are designed for their specified vehicle applications and use the mounting arrangement supplied with the product.

Before installation:

• compare the vehicle with the product fitment data;
• confirm the engine and transmission type;
• check all mounting points and supplied hardware;
• verify clearance around the exhaust, cooling system and moving components;
• confirm access requirements for the oil drain plug, filter and routine servicing.

Some gearbox plates require the corresponding engine plate for installation. This dependency is stated on the relevant product pages and should be checked before ordering an individual gearbox section.

Professional installation is recommended when the owner does not have the necessary tools or experience.

Driving conditions where protection is useful

Audi Allroad underbody protection can be useful beyond off-road driving. Common road hazards include:

• deep potholes with sharp edges;
• loose stones and gravel;
• broken or raised asphalt;
• compacted snow and frozen winter ruts;
• road debris and construction-site access roads;
• uneven forestry or rural routes.

Winter conditions can combine impact risk with corrosion exposure. Packed snow can hide hard objects, while road salt can remain trapped around plates, brackets and mounting points. Regular cleaning and inspection are therefore important.

Read our guide to underbody protection for winter and bad roads.

How to choose the correct Audi Allroad skid plate

Use the following checklist before ordering:

1. Confirm whether the vehicle is an Audi A4 Allroad or Audi A6 Allroad.
2. Check the production year and exact generation.
3. Confirm the engine type and fuel type.
4. Check whether the vehicle has a manual or automatic gearbox.
5. Identify whether engine, radiator, gearbox or combined protection is required.
6. Check whether the gearbox plate requires the corresponding engine plate.
7. Compare the vehicle’s existing underbody arrangement with the product fitment data.

If there is any uncertainty, use our VIN compatibility check before ordering.

FAQ

What does an Audi Allroad skid plate protect?

Depending on the selected product, it can protect the engine, oil-sump area, lower front-bumper area, radiator, gearbox or a combination of these zones.

Does one skid plate protect the complete underbody?

No. Some products protect only the engine and radiator, while others protect the gearbox. Complete coverage may require more than one compatible plate.

Are Audi A4 and Audi A6 Allroad skid plates interchangeable?

No. Plates must be selected for the exact vehicle model, generation, year, engine, transmission and underbody layout.

Is the Audi Allroad gearbox plate installed independently?

Not in every application. Some gearbox plates require the corresponding engine skid plate for installation. Check the relevant product page before ordering.

Are all Audi Allroad skid plates made from steel?

The Audi Allroad protection currently listed in this category is made from 2 mm steel.

Does installation require drilling?

The listed products are designed to use the specified mounting arrangement for the relevant vehicle application. Check the installation guide and vehicle before fitting.

Can the skid plate affect routine servicing?

Service access depends on the plate design and vehicle configuration. A protection section may need to be removed when access to the oil drain plug, filter or other service components is restricted.

How should steel protection be maintained?

Remove mud, stones, packed snow and road salt. Inspect the plate, brackets, fasteners and powder-coated finish after winter use or significant impacts. Repair damaged coating where required.

How can I confirm compatibility?

Check the VIN, model, production year, engine, transmission and underbody layout against the product information. If uncertain, submit the VIN for a manual compatibility check before ordering.