2007-2026 Peugeot 308 Problems: 3 Issues Every Owner Should Know
2007-2026 model years · 240+ owner reports · Updated April 2026
According to Au7o's analysis of 240+ owner reports, the 2007-2026 Peugeot 308 has 3 documented known issues, with 2 rated critical. The most serious are DPF Regeneration Failure ($200-$2,500 repair) and AdBlue System Fault ($300-$1,200 repair). Across all issues, repair costs range from $200 to $2,500. DIY maintenance guides at au7o.io.
All 3 Known Issues
When Issues Typically Appear
On the 2007-2026 Peugeot 308, 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.
Common Symptoms
- DPF warning light
- Limp mode activation
- Failed regeneration attempts
- Exhaust smoke during regen
How to Fix
Top up the Eolys DPF additive fluid, perform a forced regeneration, and clean the DPF pressure sensor pipes. Replace the DPF if soot loading exceeds recoverable levels.
On the 2014-2026 Peugeot 308, 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.
Common Symptoms
- AdBlue warning light
- Engine start countdown
- NOx sensor fault
- Reduced power
How to Fix
Replace the NOx sensor and clean the AdBlue injector. Flush the AdBlue tank if crystallization is present. Reset the SCR system counters with diagnostic equipment.
On the 2007-2021 Peugeot 308, 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.
Common Symptoms
- Rough idle
- Black exhaust smoke
- Loss of power
- Check engine light
How to Fix
Clean or replace the EGR valve. Install an EGR cooler bypass blanking kit if permitted in your region. Update the ECU software to revised EGR control maps.