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2007-2008, 2018-2023 Audi RS4 Problems & Issues

2007-2008, 2018-2023 model years · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

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According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2007-2008, 2018-2023 Audi RS4 has 2 documented known issues. No issues are rated critical, indicating generally reliable ownership. DIY maintenance guides at au7o.io.

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In This Article

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  • FAQ

All 2 Known Issues

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Audi TSB 2075530/1 documents that deposits in TFSI inlet ports and inlet valves can cause rough idling after a cold start and sporadic misfires, especially on vehicles used mainly for short trips. For the 2018-2023 RS4 2.9T record, this supports a symptom-triggered diagnosis and repair path; it does not establish that every vehicle has a chronic defect or needs cleaning at a fixed mileage.

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

Common Symptoms

  • Rough idle after a cold start
  • Sporadic engine misfire recorded in event memory

How to Fix

Confirm the cold-start complaint, review the engine-control-unit event memory and verify inlet-port or inlet-valve deposits before cleaning. When that condition is confirmed, Audi TSB 2075530/1 directs the shop to remove the intake manifold or compressor and clean the inlet valves and ports by walnut blasting; the cylinder head remains installed. The cited Audi guidance does not support a mandatory 60,000-mile interval, a fixed price, dual catch cans, additive at every oil change, a 5,000-mile oil interval or a drive-hard prescription. Do not buy a catch can or cleaning product solely from this card.

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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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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 2007-2008, 2018-2023 Audi RS4 has 2 documented issues. The most frequently reported are: 2018-2023 RS4 2.9T Cold-Start Misfire from Confirmed Inlet Deposits, 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 2007-2008, 2018-2023 Audi RS4 has 2 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. No issues are rated critical, suggesting generally good reliability. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

What year Audi RS4 is the most reliable?

Reliability varies across model years of the Audi RS4. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2007-2008, 2018-2023 Audi RS4 with 2 documented issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports.

What is the 2018-2023 Audi RS4 2018-2023 RS4 2.9T Cold-Start Misfire from Confirmed Inlet Deposits?

Audi TSB 2075530/1 documents that deposits in TFSI inlet ports and inlet valves can cause rough idling after a cold start and sporadic misfires, especially on vehicles used mainly for short trips. For the 2018-2023 RS4 2.9T record, this supports a symptom-triggered diagnosis and… Severity: medium.

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.