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2008 Audi RS4 Problems: 1 Known Issue

2008 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

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Vehicle data and repair guidance on this site are compiled with AI assistance and may contain errors. Always verify with your service manual or a qualified mechanic.

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According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2008 Audi RS4 has 1 documented issue. None of the listed issues is rated critical; this is not a complete reliability assessment. DIY maintenance guides at au7o.io.

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In This Article

  • Engine1
  • FAQ

All 1 Known Issue

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On the 2007-2008 Audi RS4 4.2L FSI V8, audi guidance documents that fuel-related deposits can cause a rough cold start, hesitation, reduced performance and misfire faults. For the B7 RS4 4.2L FSI V8, Audi TSB 2022030/2 treats P0300 and cylinder-misfire faults as a diagnostic starting point and first distinguishes injector deposits from other causes. These symptoms do not by themselves prove intake-valve buildup, and Audi does not specify a recurring 30,000-60,000-mile cleaning interval in the cited guidance.

This issue also affects: Audi S8, Audi A4, Audi A1

Common Symptoms

  • Rough running after a cold start
  • Cold-start misfire with the malfunction indicator lamp on
  • Hesitation or reduced engine performance

How to Fix

Have the cold-start event and stored faults diagnosed before authorizing intake cleaning. The B7 RS4 bulletin first checks whether its fuel-additive and follow-up procedure resolves injector-deposit misfires. Current TSB 2014753/13 warns that gasoline additive can clean FSI injectors and combustion chambers but not FSI intake valves. If the misfire remains, the shop should continue guided diagnosis and confirm inlet-valve deposits before using the applicable mechanical-cleaning procedure. Do not buy a scanner, oil bundle or cleaning service solely from this card.

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Other Audi Models

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Frequently Asked Questions

What are the most common Audi RS4 problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2008 Audi RS4 has 1 documented issue. The documented issue is: 2007-2008 RS4 Deposit-Related Cold-Start Misfire - Diagnose Before Cleaning. None are rated critical, but regular maintenance is recommended.

Is the Audi RS4 reliable?

The 2008 Audi RS4 has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

What is the 2007-2008 Audi RS4 2007-2008 RS4 Deposit-Related Cold-Start Misfire - Diagnose Before Cleaning?

Audi guidance documents that fuel-related deposits can cause a rough cold start, hesitation, reduced performance and misfire faults. For the B7 RS4 4.2L FSI V8, Audi TSB 2022030/2 treats P0300 and cylinder-misfire faults as a diagnostic starting point and first distinguishes inje… Severity: medium.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.