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Audi A4 B6 common faults.

2001–2004. The fault list covers this generation and the engines in it. If the listing gives the exact version, pick it below.

Audi A4 B6

WikiPimpi / Public domain

What to watch for

What can go wrong on this car?

The list covers the generation, the engines and the transmissions. Once you pick the version, only the faults that apply to it stay.

critical2

expensive4

Dual mass flywheel: diesel

expensive

The internal springs of the flywheel tire, and the two discs knock against each other.

Applies to the engine AVB, AVF, AWX and 8 more.

PD TDI: camshaft and rocker wear

expensive

The PD injectors (on the 1.4, 1.9 and 2.0 TDI alike) are driven by the camshaft itself, against more than 2,000 bar.

Applies to the engine AVB, AVF, AWX.

comfort2

Secondary air system: pump and combination valve (P0411)

comfort

From the late nineties to around 2006, petrol engines used a secondary air pump to blow fresh air into the exhaust on a cold start, so the catalytic converter reaches operating temperature faster.

Applies to the engine ALT, ALZ, ASN and 5 more.

1 more faults belong to this generation. On the version page, only the ones that apply stay.

Official recall6 recallsShow

The manufacturer fixes these for free at a franchised dealer. Ask with the VIN whether it was done. The list covers the whole generation. We did not filter it by model year. Some apply only to a narrower production window.

Most recent: 22 October 2021

A12/01579/21Safety recallInjuries22 October 2021 · EU Safety Gate

The functioning of the relevant NADI airbags manufactured by Takata, in particular the gas generator, may be impaired in the vehicles concerned due to the age of the device. In such cases, the protective function of the driver airbag may be reduced when the airbag is activated. The product does not comply with the requirements laid down in the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: 22/10/2021

The authority's notice

A12/00788/23Safety recallInjuriesno date · EU Safety Gate

The airbag may deteriorate over time and if deployed, excessive internal pressure may cause the inflator body to burst and metal fragments could pass through the cushion material causing injury to occupants. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: Unknown

The authority's notice

A12/00884/21Safety recallInjuriesno date · EU Safety Gate

The propellant used in the airbag inflator of the passenger airbags, manufactured by Takata, may experience a material alteration over time due to degradation occurring after prolonged exposure to high absolute humidity and high-temperature cycling. In the event of an airbag being deployed, the excessive internal pressure may cause the inflator body to rupture and metal fragments may pass through the cushion material causing injury to the occupants.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: Unknown

The authority's notice

A12/01891/20Safety recallInjuriesno date · EU Safety Gate

The Takata gas generator housing could burst when the passenger airbag is deployed. This may cause small metal parts to become detached from the housing, posing a risk of injury to the occupants.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: Unknown

The authority's notice

A12/01957/24Safety recallInjuriesno date · EU Safety Gate

The propellant in the driver airbag may deteriorate over time. If the airbags deploy, it could result in fragments from the inflator injuring the vehicle's occupants. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: Unknown

The authority's notice

SR/00790/26Safety recallInjuriesno date · EU Safety Gate

The driver airbag inflator may cause uncontrolled inflation and release metal fragments when the airbag is activated, which can cause injury to the occupants. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: Unknown

The authority's notice

Engines and transmissions in this generation

A fault is often tied to the engine, not to the whole generation. You find the engine code in the registration document.

B6 · 2001–2004

Pick the version.

The fault list opens on the version page.

138 versions

Showing 60 of 138 versions.

Neighbouring generations

B6 · 2001–2004

B6 (2001-2004). If the listing is from the changeover year, look at the neighbour too.

Previous generation

B5 · 1994–2001

This generation

B6 · 2001–2004

Next generation

B7 · 2004–2008

Common questions

About this generation

Which years does this page cover?

2001–2004. The changeover year can fall in two generations. If the listing is from that year, look at the neighbour too.

Does the fault apply to every car like this?

No. It depends on the engine and the transmission too.

Is it free?

The fault list is.

Information, not an expert opinion

We write the descriptions, and we put the source next to them. A person reviews them before they go out. They are still information, not a technical expert opinion.

  • A fault on the list does not mean the car you are looking at has it.
  • A fault missing from the list does not mean the model is fault-free. Write-ups are made model by model. Not all of them are done.
  • You decide whether to buy. This is no substitute for an inspection. That needs a workshop and a history check.
Details in the terms