EE20 Engine Info


Subaru EE 20 engine, early Euro 4 emissions standard, open-type DPF

Engine management including many parts/assemblies and are DENSO Corporation.


  • Under construction, do not hesitate to report errors or data!
  • Car specifications for current models are available at:
Topic / Emission Standard Euro 6 Euro 5 Euro 4
Designation EE20
Displacement 1998 cm3
Max power 110 kW (150 PS, 148 hp) @ 3600 rpm
Forester, XV: 108 kW (147 PS, 145 hp)
In some countries for tax reasons reduced power options are available i.e. 81 kW (109 PS), 300 Nm
Max torque 350 Nm (35.7 kgf·m, 258 lbf·ft) @ 1600-2800 rpm 350 Nm (35.7 kgf·m, 258 lbf·ft) @ 1800-2400 rpm
Valve train DOHC, 4 valves per cylinder
timing chain (2x, Euro 6: 3x including fuel pump chain)
Bore × stroke 86.0 × 86.0 mm
Compression ratio 15.2 16.0 16.3
Fuel injection system DENSO common rail direct fuel injection
Euro 6 addition: pressure relief valve, controlled by ECU
DENSO common rail system generation G4 G3 G2
High Pressure Pump DENSO HP3 (2 plungers, trochoid feed pump, SCV, fuel temperature sensor)
Pump drive chain helical gear
Common rail pressure (@ idle / max) 30 MPa (300 bar, 4,350 psi) / 200 MPa (2,000 bar, 29,000 psi) 30 MPa (300 bar, 4,350 psi) / 180 MPa (1,800 bar, 26,100 psi) 25 MPa (250 bar, 3,630 psi) / 180 MPa (1,800 bar, 26,100 psi)
Injectors solenoid-type, 8 holes, each injector has its calibration code; for replacement E4/5 models require taking out engine
Injector hole diameter ? 0.121 mm 0.133 mm
Glow plugs ?, dedicated glow control unit, monitoring each plug ceramic type metallic type
High Pressure Exhaust Gas Recirculation (EGR) without HP EGR cooler HP EGR cooler (water)
Euro 5: enlarged
Low Pressure Exhaust Gas Recirculation (EGR) DPF → exhaust main pipe till exhaust pressure control valve → LP EGR cooler (water) → LP EGR valve → turbo inlet Euro 4/5: not available
Intake manifold resin material (black plastic), 1.5 kg lighter (bright) aluminum casting
Turbocharger type VGT (Variable Geometry Turbocharger) (variable nozzle/vanes, vacuum actuator, vane position sensor except for Euro 4 models)
Turbocharger details Honeywell Mitsubishi or IHI (newer models) IHI RHV4 VF50, max 190,000 rpm, no vane position feedback
Catalytic converter oxidation catalyst, inside DPF casing
Diesel Particulate Filter (DPF)
  • silicon carbide honeycomb
  • closed-type, managed; active regeneration initiated by engine (fuel post injections – causing oil dilution)
  • First generation (= MY2008/2009 Legacy/Outback only): open-type, unmanaged (no sensors etc.)
Air/fuel ratio (A/F, lambda) sensor downstream DPF not available
Cylinder block aluminum alloy
Engine oil capacity 5.9 litre ? 5.5 litre
Coolant capacity 8.3 litre ? 8.6 litre
Subaru Diesel Euro 4 Drawing

Subaru EE 20 engine drawing, early Euro 4 emissions standard, open-type DPF

Power graphs

Euro 4, from official Subaru press information:

Digitized above curves, own replot:

View as SVG vector graphics (best quality, modern web browser needed): PowerGraph(Subaru).svg

Raster screenshot in case you cannot view SVG:


Euro 4/5 engine management schematic, based on generic DENSO diesel management.
Boxer Diesel Engine Management (Euro 4/5, based on DENSO)
Euro 6: more complicated, schematic under construction…

Injections, Injection Patterns

Apparently all models support up to 3 pilot and post injections per stroke. Not all 9 possible partial injections are being used at the same time, mostly just 2 (pre + main) or 3 (pilot + pre + main). The ECU software decides based on current running conditions (start, warmup, power demand, active regeneration etc.). The ECU itself contains high voltage circuit for driving the injectors. As the ECU is not actively cooled, the number of injections at higher engine speeds are limited.

9 time injections (Denso)

Links to articles / photos

Links to photos


46 responses to “EE20 Engine Info

  1. hi i want to put ee20 in a small aircraft zenith ch801 stol can you tell me the total dry weight of the engine and weather it is a suitable engine in aircraft use thanks mukesh


  2. Do you have the height, length and width dimensions of the total engine?


  3. can anyone tell me more about the subaru engines used in aircraft applications? i have read that subaru have actually made them, and they are not converts from auto engines…i have heard there is a 2.0 L and a 2.5 l TURBO…and above all…the WEIGHT of these?


    J.R south africa


  4. Pingback: ('09+) What drives the Diesel engine tacho? - Subaru Forester Owners Forum

  5. I’ve been reading up on the Subaru Boxer diesel engine, and was more than impressed with how well it sells in other countries. Now, why the hell doesn’t Subaru just sell it here in the United States? Never mind what the marketing people say what the market is ready for. What the hell do they know about what real Subaru drivers and owners want in their cars? Do they ask people “what engine do you want to power your car?” or “how would you feel about a boxer style diesel engine under the hood of your Subaru Outback, or Legacy, Forester, or Tribeca?” No, they don’t. They assume that the American people don’t want a diesel engine powering their cars. Well, there may be some who, no matter what you tell them about the advantages of diesel, will never be caught dead with a diesel powering their cars. But there are also people who are willing to have a more open mind and would give it a go before making a decision. If given a chance to choose between a 2 litre boxer gas engine or a 2 litre boxer diesel engine, I believe it’d be a close 50/50 who would choose the two engines.


  6. It’s really a cool and helpful piece of info. I am happy that you simply shared this helpful info with us. Please stay us informed like this. Thanks for sharing.


  7. Hey there, You have performed an excellent job. I’ll certainly digg it and in my view suggest to my friends. I am sure they will be benefited from this site.


  8. Pingback: Need some advice: Subaru Forester Possibilities - Fuel Economy, Hypermiling, EcoModding News and Forum -

  9. Szilárd Kiss

    Any new infos regarding the 2012 engine?


  10. Hey can anyone tell me where is the position in the engine of the common rail electrical outlet in order to fit box chip tunning, I am howner subaru forester diesel 147 hp. Can anyone send me detailed pictures.
    Many thanks.


  11. It’s unforgivable that the Subaru Boxer Diesel has never been offered here in North America. I mean really! Can you imagine what such an engine could be used for? With its 2 litre displacement, I can see the engine powering a VW Vanagon that was originally powered by the VW Wasserboxer engine. How about a Corvair with a boxer diesel engine? Maybe a Corvair Ultra Van. Who knows? Hopefully in my lifetime it’ll make it to the US market.

    Liked by 1 person

  12. EE20 is a weapon if tuned right. Few guys down here in Aus have some pretty sweet setups.


  13. What I’d like to see is the EE20 Boxer Diesel here in the USA. We would also need specialists who know how the engine works, and how to maintain the engine to keep it operating reliably.


  14. Hello, I owne an 2011 Subaru Forester with EE20 Engine (Euro5) with broken crank shaft. Got a chance to buy a complete (everything attached) 2013 EE20 Engine (Euro6). Will this engine fit in my car? Cheers


  15. I have a Euro 6 engine. Let me know what data I can pull off of the engine.
    I am searching for the wiring harnesses, and all ECU’s.


  16. If you need Euro 6 engine data such as part numbers of components – I can help.
    Regarding parts, I am searching for reputable online vendors who can ship to the USA.


  17. SubForester4to5

    Hi there. I have a 2009 Forester EURO4 – broken crankshaft. Purchased a EE20 2013 EURO5. But DENSO diesel system is totally different. I godt CPU and wires – but it seems almost impossible to have that EURO5 fitted in to my car. Any experience out there in what order I shall manage this shift…??


  18. Hi!
    I’ve got a doubt, maybe a hard one. I’ve got the Forester MY16 with EE20 EuroIV engine.Theorically, it have a low pressure and high pressure EGR system. I can’t find if the low pressure EGR is after or before the DPF. I think this is useful, because if it’s after the DPF i do not have to worry about soot acumulation in that valve. (?)
    I think I think I’ve misunderstood this kind of system. Is there two EGR valves, one for LP and another for HP, or only one, but after the DPF?

    Thank you so much, and sorry about my english…


    • Hi! Yes, Euro 6 has high (like EGR in Euro 4/5) and low pressure EGR valves. Also an “exhaust pressure control valve”. In total, they added two additional valves, all controlled by ECU of course. Currently not sure whether LP EGR valve is after DPF. Will try to decipher more details and post some updates soon…

      Update: Yes, exhaust pressure control valve is after DPF, somewhere behind the engine to the rear, attached to main exhaust pipe. There, via T-fitting additional EGR piping goes to front right, close to turbo, where LP EGR valve is located. All those exhaust related valves as well as throttle have usual 5-pin-connectors (power, ground, position sensor, motor+, motor-).


      • Hi!
        Thank you so much for taking care of my answer!
        I’ve just seen your update. So, as I’ve understood, the only valve after DPF is the “exhaust pressure control valve”. The other two are both before the DPF and they are prone to get dirty with soot. Am I correct?
        I’m a little worried about it because the CVT is almost always at low rpm (1600-1800) and as far as I know, at low rpm, engines produce more soot. Is this correct?

        PS: If it’s any help, I’ve watched that with the A/C on, the EGR valve remains closed (0.0° on Torque app). I’ll keep watching it.


      • Hi!
        On Euro 6 unfiltered soot is only routed through high pressure EGR loop – exhaust manifold, piping, HP EGR valve and intake manifold.
        Being fed after DPF are: exhaust pressure control valve, (low pressure) EGR cooler, LP EGR valve, turbo compressor, intercooler, throttle and finally intake manifold.

        Subaru diesel (Euro 4 and probably newer) stock maps tend to produce lots of soot at low rpm when accelerating – turbo needs time to spool up in order to deliver manifold air pressure. Can’t see exhaust smoke with DPF attached. Low rpm and low power demand is fine – also extends distance between regens from my experience.

        Haven’t got Euro 6 log data yet.


  19. My EE20 which is Euro 6 is a Honeywell turbo, so you can update the chart accordingly. Let me know if you need any details.


  20. have the crankshaft problems been addressed in the euro 6


  21. l am Looking for vacuum pump for subaru EE20 , Does someone knows where I can buy one?


  22. Looking for a little clarity on this engine, I am looking to buy a 2010 Forester (boxer diesel), is it true the entire engine needs to come out in order to replace a fuel injector?

    Thanks for the help!


  23. Hi. I have an -10 outback ee20 with broken crankshaft, can any one tell me witch years of motors that will fit in my car? Kim


  24. Pay the biggest attention to the EURO number (EURO4,5,6 etc) I did the failure, listening to a so called professional seller from ebay – uk seller. He just told me EE20 is and EE20 – so he sold me a brand new EE20 – 24 miles EURO 6. No matter how much I struggle I will never have this up and running in my Forrester EE20 EURO4.
    So I have an brand new EE20 24 miles on the shelf.) EE20 Turbo Diesel Engine for 2013-2014 Subaru Legacy Outback & Forester, Turbo Diesel.
    This is a Genuine Subaru part and in Excellent As New Condition.
    It has ONLY DONE 24 MILES (Yes 24 Miles) since new and was removed from a 2013 Model Showroom Displayed Subaru Legacy Outback, Turbo Diesel and it fits all the Turbo Diesel Subaru models, i.e. Legacy Outback, Forester, & Impreza.


    • Hello, I’m writing from Portugal. I am thinking about buying a 2nd hand Subaru Outback, of 2010 but before the face-lift. The car as 120.000km always maintained in Subaru Portugal.
      Is there a big risk of getting into trouble by buying it. How much more km will I get?
      Thanks in advance


  25. reading about cleaning MAF on Subaru, somebody suggest every year at least one cleaning, got any knowledge about it.
    Best regrads


  26. Hello, I have an 09 impreza EE20 turbo diesel 2.0 from Poland. What coolant do you recommend for this car?


  27. What EE20 boxer diesel does the 2014 Japanese forester or outback run is it Euro 4, 5, 6?


    • I don’t think there are JDM (Japanese domestic market) versions, Japan is not a diesel country after all.
      I have this ROM for example:
      2014 Forester Turbo Diesel 2.0 6MT EDM 108 kW / 147 PS
      CID JF6A003A
      ROMDate 2014-08-05
      ROMID 9244D87007
      CVN 6193E3D2 DBD1F80E
      PAK 22611BC490-1

      It is Euro 5 for sure, 1.5 MB size.
      AFAIK, last Euro 4 models were MY2010, MY2015 and newer are Euro 6.
      By the way, CVT transmission for diesel first available with: Outback MY2013, Forester MY2015.


  28. Jack Dhaliwal

    Hi there, can you please recommend a tool that I can use to perform DPF force regen on my 2017 diesel forester. Your help is much appreciated.
    Jack D


    • Not really, I am not aware of available 3rd party software, little info in forums it seems. OEM Subaru Select Monitor at dealerships is first choice if possible.
      I thought about creating tools myself, selling enough to cover R&D expenses is the problem…


  29. Juri Lyubarski

    Hi. Motor EE20 worse motor I have not seen in 30 years of working in the service. Throughout Europe many, many machines for sale with motor failure. And how many were replaced under warranty? What other owners of the failed release? They need their money to pay for the mistakes of the plant. Common failure is the fracture of the crankshaft


  30. Hi there. unfortunately I have to admin Juri is right. I had MY09 Forester and sold as I was afraid of the broken crank shaft issue. Now reading lots of forums I found out that later models (>2011) still have this problem, but not that mush as the first generation. I was looking now for a 2012-2013 Forester but now I have doubts. The local dealer says the euro 5 models has no longer this problem, but I do not trust anymore. Even with this I am still a Suby fan but I found myself in the point that I have to choose something else (really difficult).


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