2004 model year · 155+ owner reports · Updated August 2026
According to Au7o's analysis of 155+ owner reports, the 2004 Citroen C4 has 2 documented known issues, with 1 rated critical. The most serious is Diesel DPF Regeneration Issues ($300-$2,500 repair). Across all issues with published estimates, repair costs range from $150 to $2,500. DIY maintenance guides at au7o.io.
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According to Au7o's analysis of 155+ owner reports, the 2004 Citroen C4 has 2 documented issues. The most frequently reported are: Diesel DPF Regeneration Issues, EGR Valve Carbon Buildup. Of these, 1 is rated critical and should be addressed promptly.
The 2004 Citroen C4 has 2 known issues documented across 155+ owner reports. 1 issue is rated critical: Diesel DPF Regeneration Issues. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Citroen C4 issues range from $150 to $2,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Diesel DPF Regeneration Issues, typically costs $300-$2,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
The C4 diesel models suffer from the common PSA DPF regeneration problems, with the additive-based system requiring regular Eolys fluid top-ups. Short journey use prevents passive regeneration from completing. Repairs typically run $300-$2,500. Severity: high.
The C4 diesel EGR valve accumulates carbon deposits that cause it to stick open or closed. The blocked EGR increases exhaust emissions, causes rough idle, and can trigger the engine management warning light. Repairs typically run $150-$500. 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.
