The 2010-2015 Subaru Outback Diesel (EE20 engine) frequently suffers from DPF clogging due to incomplete regeneration cycles, leading to 'Limp Mode' and potential engine damage.
Reviewed by SubaruReview Editorial Team · Last reviewed 2026-05-15 · Editorial standards
How this problem ranks against the other documented Outback failures — cost, severity, and DIY difficulty at a glance.
| Problem | Years | Severity | Repair cost | DIY |
|---|---|---|---|---|
| Subaru Outback DPF Regeneration Failure & Clogging (this page) | 2010-2015 | Major | $800–$3,500 | 4/5 |
| Catalytic Converter Failure (P0420) | 2010-2019 | Major | $1,500–$2,500 | 3/5 |
| Excessive Oil Consumption | 2011-2015 | Major | $3,500–$5,500 | 1/5 |
This is one of several documented Outback problems we track, and it fits inside the broader Engine Guides guide. If you're weighing repair against replacement, cross-check the Subaru repair-cost database and any open NHTSA recalls on your VIN before booking a shop.
The Diesel Particulate Filter fails to burn off accumulated soot. When soot levels exceed 65%, the ECU disables automatic regeneration to prevent fire risks, forcing the car into a restricted power mode (Limp Mode) and requiring dealer intervention or a manual stationary regeneration.
Short-trip driving cycles prevent the exhaust from reaching temperatures necessary for passive regeneration, leading to soot accumulation that exceeds the ECU's safety limit for active regeneration.
Short-trip driving cycles prevent the exhaust from reaching temperatures necessary for passive regeneration, leading to soot accumulation that exceeds the ECU's safety limit for active regeneration.
National average $800–$3,500. Costs vary wildly between a chemical manual clean ($800) and a full OEM DPF replacement ($3,000+).
Difficulty 4/5. Replacement of the DPF unit with updated Subaru part, cleaning of the EGR system, and updating the ECU firmware to the latest calibration.
Flashing DPF warning light; Solid Check Engine Light (CEL); Sluggish acceleration and reduced power (Limp Mode); Noticeable drop in fuel economy; Excessive black smoke from exhaust during acceleration
Owners typically pay $800–$3,500 at an independent Subaru shop, parts and labor included. Our Subaru Timing Chain Replacement Cost (FB Engines) guide breaks the job down by parts, labor hours, and where the money actually goes.
The same generation also sees Catalytic Converter Failure (P0420) and Excessive Oil Consumption. Both are documented with symptoms, cost, and a permanent-fix walkthrough — see the full list in the Outback hub.
We rate it 4/5 on our DIY scale. Most owners come out ahead with an independent Subaru shop; read labor-hour benchmarks in the repair-costs hub before you commit tools and a weekend.
Dig into the Problems Database to plan your next maintenance sprint, or browse every model hub for buyer's guides, generation breakdowns, and known-issue lists.