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2009 - diesel MT - DPF light blinking, P1468 & 1469 active?

23K views 6 replies 5 participants last post by  DieselForry  
#1 · (Edited)
Hi All, coming back from vacation, the DPF light came on blinking, normally it goes steady, then asks speed request...this time went straight to blinking so I thought just time for oil change (oil dilution >10% causes blinking directly). After getting on the highway, the MIL and traction control light came on (I guess this is limp home mode). When I got home, I checked the logs, 2 codes are active P1468 Oil Dilution & P1469 DPF Limp Home Mode are active. Soot is between 120-160%, cumulative ash 6%, time since last injector learning 1900km, delta pressure DPF around 15-20kPa. Before this, the car had tried to do several regens, shooting out a lot of dark smoke while driving low speed 1st/2nd gear, especially after stop.

Normally if DPF light comes blinking first, it means oil dilution is >=10%, but after some driving MIL also came up, therefore not sure if oil dilution counter reset is adequate. I do an oil change tomorrow

I know this DPF issue is a common forester issue

Car is 2009 turbo diesel forester, euro 4

Appreciate any input

many thanks
 
#3 ·
Sounds just like the problem I encountered with my 2012 Forester turbo on 31/12/22. I didn’t know that it could be linked to the oil dilution warning which in my case should be a false alarm probably caused by my local mechanic not doing whatever was needed to make the ECU aware of the last oil change.
All the service centres in Canberra have been having a break for the new year. Hopefully I can get it sorted with a forced regen and other computer based tweaks on Monday, 9/1 when they reopen.
 
#4 ·
I have experienced the same issues with my wife's Outback 2016 2L TD and was able to do a full DPF Regen which then successfully reset the DPF % back to 0%, and currently going between 0 & 30% when driving the car under "normal" operation (e.g. These vehicles are NOT designed for city driving or going to the shops and back, which is something they failed to mention when you purchase the car brand new at the dealership!

I am using a cheap Android ELM327 WIFI Reader type scan tool to check the vehicle's vitals using "Torque Car Scanner” App (free version) available on Google Play Store. Note that I have not upgraded to their "Prop" version after being advised by the App Developer that it did not support the P1468 Special Function reset. So just using the App to basically monitor the DPF Ratio, Soot Ratio, DPF Regen Switching, Oil Dilution Ratio, DPF Temp, DPF Cumulative Count and DPF Attempts on the primary screen, which basically gives me a good idea on how the car is going on this topic of interest.
I am looking around for an affordable Scan Tool (say below $750) capable of resetting the P1468 Code after completing the required Oil/Filter change (and DPF level as applicable) and would welcome any reliable and proven fix (manual and/or scan tool) able to reset an Outback 2016 2L TD P1468 Service Code.
 
#5 ·
I have autel ap200 (~60€ from aliexpress with one car brand with lifetime support and other brands for extra cost) which was able to reset "new dpf installed" on my friends 2016 Outback. It was in limp home mode and the tool was able to bring the car back to life untill the dpf issue is sorted. Probably it can do other operations as well, I have not tried.
It can also read live data and trouble codes in all computers on the car, like body control, airbags, abs, climate, tire pressure monitoring, eyesight and others.
 
#6 ·
Thank you for your response @DieselForry.
Yes, I believe that actual DPF issues generate a P1469 Code, as opposed to P1468 triggers by an 'Oil Dilution Ratio %' issue which both manifest/share the same DPF Warning Light on the car.
The P1469 Code can be resolved in numerous ways and typically does not need a Scan Tool to reset itself, as the ECU as an 'Auto DPF Regen' Special Function within its progam that does it after it has successfully completed the "Auto Regen" process. The 'EML327 Reader' permanently connected to our car monitors if/when the ECU "Auto Regen Switches" turn on.
Note: Typically the ECU 'DPF Regeneration Attempts' Count will be higher than the actual 'DPF Regenerations' count, and in my case, I think it is around 216/96. The reason for this is that the DPF Regen activation switch may come on say a few miles/kms from your destination at which time you will turn off the car before it is able to complete the "Burn-Off" (being unaware of this status), which basically counts as an "Attempt" and not as a "DPF regeneration" (and recorded as such on the car ECU, hence the difference in counts).
Note that it is recommended to drive the car in 'Manual Mode' in 3rd gear or above with the RPM between 1,600 to 2,500 revs after the 'DPF Regen Switch' has come on (Check your SUBARU Manual).
I have set a number of Indicators, Dials and respective Alarms on the 'Torque Car Scan' Android App (see previous thread) so that it will ring an 'Alarm' tone to let me know that it just turned on and if convenient I would then have the option to keep driving in the aforementioned "right conditions" for it to complete successfully.
I'll check your Autel AP200 Scan Tool capability on their site to see what it offers, many thanks again for your response.
PS: I realise that you may already know the "workings" of this vehicle's software (ECU)/hardware (Sensors), but try to provide what I know/researched on this topic to help/inform other readers perhaps newer to the topic or even correct something I may have miss understood.
Cheers Al
 
#7 ·
Few years ago I created a device which I called DPF monitor to monitor all important data about DPFs life. Been driving around with it plugged in since then and I has been really useful.
 
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