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MANUFACTURER DOCUMENTATION

Audi A4

Engine-specific crankcase-ventilation and underboost cases.

Documented years: 2005–2008; 2009–2010 (separate bulletins)

Match the document’s model, years, engine, market and other conditions. This page does not establish every code the vehicle can display.

Diagnostic guides

Audi A4 P0299: confirm the CAEB wastegate diagnosis

A4 CAEB: distinguish intake faults, sporadic codes and confirmed wastegate wear before replacing a turbocharger.

Audi A3/A4 P2187, P2279 or P1297: match the PCV hardware first

Identify the applicable hardware and update history.

Manufacturer bulletins

Static P029900

CAEB wastegate evaluation.

Scope: 2009–2010 · CAEB

Displays in the document: P029900

Follow current Audi guided diagnosis.

Requires matching vehicle and fault conditions.

Read the diagnostic case guide

Pressure-control diagnosis

VIN-limited pressure-control case.

Scope: 2005–2008 A4; 2006–2008 A3 · A4: BPG (2005–2006), BWT (2007–2008); A3: BPY

Displays in the document: P1297, P2187, P2279

See the diagnostic guide.

Full VIN and engine matching required; see source applicability table.

Read the diagnostic case guide

Sources and scope

  1. 2015505/10 — Crankcase ventilation diagnostic bulletin (2012-03-16)

    Audi of America · Checked 2026-10-30

  2. 2031245/6 (2013-07-09)

    Audi of America · Checked 2026-10-30

  3. 2031245/5 (2013-06-07), superseded historical scope

    Audi of America · Checked 2026-10-30

  4. 2013060/7 (2015-03-12)

    Audi of America · Checked 2026-10-30

  5. 17D9 / 24T4 / 24T3 notice (March 2012)

    Audi of America · Checked 2026-10-30

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