Audi A4 2.0 TDi: Common Problems & Reliability Guide

Also covers: A4 2.0 TDI

Real, sourced data · last reviewed 2026-08-18

Reviewed by [ADD REAL NAME], [ADD REAL YEARS/BACKGROUND - e.g. "12 years independent workshop experience"] - our sourcing methodology

Two distinct real issues: (1) EA189 emissions-defeat-device software, (2) mechanical EGR/DPF/injector wear common to this engine generation

Engine / Emissions / Regulatory · severity: Regulatory/compliance issue for (1) - real but not a drivability risk once the recall fix is applied; Moderate for (2) - real repair costs, not typically stranding-risk · confidence: 70/100 · 2 cited sources

The specific fault codes and inspection steps to check before you buy, a full repair-cost estimate, TSB/recall reference, and the buyer negotiation tip for this issue are included in the R99 vehicle report.

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This guide summarises documented, sourced findings for the Audi A4 2.0 TDi generally. It is not an assessment of any specific vehicle - mileage, service history and condition vary by example. A full AutoLytiQs report checks a specific listing against this data plus a live South African market valuation.