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Peugeot · Known Issues

2020 Peugeot 308 Problems: 5 Known Issues

2020 model year · 240+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 240+ owner reports, the 2020 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.

In This Article

  • 308 Emissions3
  • 308 Engine1
  • 308 Brakes1
  • FAQ
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In This Article

  • Emissions3
  • Engine1
  • Brakes1
  • FAQ

All 5 Known Issues

Filter:
ALL YEARS20262025202420232022202120202019201820172016201520142013201220112010200920082007

When Issues Typically Appear

AdBlue System Fault
30K-80K
DPF Regeneration Failure
40K-90K
EGR Valve Failure
50K-100K
025K50K75K100K mi
Community reported
100 owners

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.

This issue also affects: Citroen Berlingo, Citroen C4, Citroen C5 Aircross

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.

Typical repair cost:$200 - $2,500

Research This Issue

Based on 100 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence100 owner reports
Community reported
65 owners

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.

This issue also affects: Citroen Berlingo, Citroen C4, Citroen C5 Aircross

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.

Typical repair cost:$300 - $1,200

Research This Issue

Based on 65 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence65 owner reports
Community reported
75 owners

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.

This issue also affects: Citroen Berlingo, Citroen C4, Citroen C5 Aircross

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.

Typical repair cost:$200 - $600

Research This Issue

Based on 75 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence75 owner reports

On the 2014-2022 Peugeot 308, 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 year identity only at the production-window level. The frozen brake-vacuum-line, recall-volume, catastrophic-failure and 2023 chain-conversion claims are not established by that source.

Common Symptoms

  • engine and production date verified
  • timing belt inspected under current procedure
  • oil-pressure and brake-assistance risk assessed

How to Fix

If an oil-pressure or braking-assistance warning appears, stop as soon as it is safe and have the vehicle inspected before further driving. Identify the exact engine and production date by VIN, inspect the belt using the current Peugeot procedure, and when degradation is confirmed follow engine-specific instructions for the timing-belt system, oil pickup/lubrication circuit, oil and filter. Check Peugeot support eligibility and the service schedule. Do not buy a timing-belt kit, vacuum pump or engine from this page; diagnosis, production date and VIN fitment must be established first.

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Aug 2026

On the 2014-2021 Peugeot 308, 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 motors on the rear calipers (water ingress/electrical failure), a worn EPB console switch, wiring harness faults, and a weak 12V battery; faults also frequently appear after rear pad changes if the actuators are not wound back and recalibrated with a diagnostic tool.

Common Symptoms

  • 'Parking brake fault' message on instrument panel
  • Flashing parking brake warning lamp
  • Handbrake will not release or car feels held back
  • Parking brake fails to apply automatically
  • Fault appears intermittently or after rear pad replacement

How to Fix

Diagnose with a Peugeot-compatible scan tool first: a worn switch or weak battery is a cheap fix, while a failed caliper actuator motor requires a replacement motor or caliper followed by EPB recalibration. After any rear brake work, the actuators must be retracted and recalibrated electronically to avoid inducing the fault.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Genuine PSA 96785851VV electric parking-brake switch for 308 T9

    Confirm VIN, EPB equipment and printed reference; not for a cable handbrake or brake-pedal switch.

    HMK Auto

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$100 - $900

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium ConfidenceVerifiedReviewed Jun 2026
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Frequently Asked Questions

What are the most common Peugeot 308 problems?

According to Au7o's analysis of 240+ owner reports, the 2020 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 2020 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?

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 sourced from 240+ owner reports, NHTSA recalls, TSBs, and automotive forums.

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.