2021 Peugeot 308 Problems: 5 Known Issues
2021 model year · 240+ owner reports · Updated September 2026
According to Au7o's analysis of 240+ owner reports, the 2021 Peugeot 308 has 5 documented known issues, with 3 rated critical. The most serious are DPF Regeneration Failure ($200-$2,500 repair), AdBlue System Fault ($300-$1,200 repair) and 1.2 PureTech Wet Timing Belt Degradation and Oil Starvation. Across all issues with published estimates, repair costs range from $100 to $2,500. DIY maintenance guides at au7o.io.
2021 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
No email neededHow interest is saved
Interest applies to the selected vehicle and configuration; it is not a reservation. Voting stores a first-party identifier for up to 180 days to prevent repeat votes. No account or email is needed. Clearing cookies or using another device may count separately. Privacy
Visual coming soon
Your interest helps us choose what to build next.
Visual Known Issues · Coming soon
$4.99/month plus taxes at launch · No payment today
All 5 Known Issues
When Issues Typically Appear
Join 600+ people using Au7o to better understand their vehicles.
Don't see your problem? Describe your symptoms to get a diagnosis, or get a full repair guide.
Other Peugeot Models
Frequently Asked Questions
What are the most common Peugeot 308 problems?
According to Au7o's analysis of 240+ owner reports, the 2021 Peugeot 308 has 5 documented issues. The most frequently reported are: DPF Regeneration Failure, AdBlue System Fault, 1.2 PureTech Wet Timing Belt Degradation and Oil Starvation. Of these, 3 are rated critical and should be addressed promptly.
Is the Peugeot 308 reliable?
The 2021 Peugeot 308 has 5 known issues documented across 240+ owner reports. 3 issues are rated critical: DPF Regeneration Failure and AdBlue System Fault and 1.2 PureTech Wet Timing Belt Degradation and Oil Starvation. 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.
How much does it cost to fix common Peugeot 308 problems?
Repair costs for known Peugeot 308 issues range from $100 to $2,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, DPF Regeneration Failure, typically costs $200-$2,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2007-2026 Peugeot 308 DPF Regeneration Failure?
The 308 diesel models experience frequent DPF regeneration failures, especially in stop-start urban driving conditions. The additive-based DPF system requires periodic Eolys fluid refills that are often overlooked during servicing. Repairs typically run $200-$2,500. Severity: high.
What is the 2014-2026 Peugeot 308 AdBlue System Fault?
The AdBlue (SCR) system on BlueHDi engines triggers false fault warnings and countdown timers to engine disable. The NOx sensor and AdBlue injector are primary failure points, often caused by crystallized fluid. Repairs typically run $300-$1,200. Severity: high.
What is the 2014-2022 Peugeot 308 1.2 PureTech Wet Timing Belt Degradation and Oil Starvation?
Peugeot confirms that previous-generation 1.0 and 1.2 PureTech engines can experience an oil-pressure issue resulting from premature timing-belt degradation. Its official terms cover affected 1.2 turbo engines produced from April 2014 through June 2022, matching the frozen 308 ye… Severity: high.
What is the 2007-2021 Peugeot 308 EGR Valve Failure?
The exhaust gas recirculation valve on diesel 308 models becomes clogged with carbon deposits, causing rough idle and poor performance. The electrically actuated valve sticks in the open or closed position. Repairs typically run $200-$600. Severity: medium.
What is the 2014-2021 Peugeot 308 Electric Parking Brake (EPB) Faults — Caliper Motor, Switch and Wiring?
308 II (T9) and later cars with the electric parking brake commonly throw a 'Parking brake fault' message with a flashing warning lamp, the brake refusing to release or failing to auto-apply. Documented root causes across owner forums include failure of the electric actuator moto… Repairs typically run $100-$900. 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.