Kenwarth Posted October 9, 2021 Share Posted October 9, 2021 Hello! I have been having issues trying to get rid of my check engine light. I have a 2015 subaru legacy and i keep getting a P0400 code. I have replaced the EGR valve and the code still seems to show up what should i move onto next? I have cleaned the system near the valve and dont seem to have a blockage. im thinking about moving on and checking the EGR Temp sensor but im not sure where it it located or if that would be causing the issue. Any help would be great thanks! Link to comment Share on other sites More sharing options...
Painless Posted October 9, 2021 Share Posted October 9, 2021 Have you plugged an ODB2 scanner/reader to clear the code after you completed your work? Do you have a copy of the full service manual to follow troubleshooting? Link to comment Share on other sites More sharing options...
Kenwarth Posted October 10, 2021 Author Share Posted October 10, 2021 (edited) Have you plugged an ODB2 scanner/reader to clear the code after you completed your work? Do you have a copy of the full service manual to follow troubleshooting? Yes i have cleared it with a ODB2 scanner after the work and i do not have a full service manual. I know some cars have EGR temp sensors but im not sure if the legacys do I don’t know much about newer EGR systems or anything on my car i really haven’t had issues this is my first time seeing the check engine light. Edited October 10, 2021 by ammcinnis Link to comment Share on other sites More sharing options...
Painless Posted October 11, 2021 Share Posted October 11, 2021 Parsed-out (what I feel) are the relevant sections of my 2016 Service Manual which should be pretty close, it not, identical to yours. Making assumptions of engine (2.5) and start options (key). Hope this helps. (corrected attachment)2016 SUBARU LEGACY SERVICE MANUAL - EGR Info.pdf Link to comment Share on other sites More sharing options...
Kenwarth Posted October 11, 2021 Author Share Posted October 11, 2021 Parsed-out (what I feel) are the relevant sections of my 2016 Service Manual which should be pretty close, it not, identical to yours. Making assumptions of engine (2.5) and start options (key). Hope this helps. (corrected attachment) THANK YOU! yep i have a 2.5 ima go take the top EGR pipe off and see what it looks like and the pictures in the PDF look just like mine. again thank you! Link to comment Share on other sites More sharing options...
Kenwarth Posted October 12, 2021 Author Share Posted October 12, 2021 Well after taking the upper EGR pipe off it was clogged up pretty bad so i cleaned it really well and it still has not fixed the code. it keeps coming back. I think next im going to try and remove and clean the bottom EGR pipe and check out and maybe replace my MAP sensor. After that im lost on what to do. Link to comment Share on other sites More sharing options...
Painless Posted October 12, 2021 Share Posted October 12, 2021 You may want to check the EGR Control Valve pin resistance called-out page "EC(H4DO)-29". Just to verify the valve is good. Link to comment Share on other sites More sharing options...
Kenwarth Posted October 14, 2021 Author Share Posted October 14, 2021 You may want to check the EGR Control Valve pin resistance called-out page "EC(H4DO)-29". Just to verify the valve is good. Yep the valve is good after checking that i spent a long time removing the bottom egr pipe due to its location it was a pain to get off but its turns out that was also clogged and after i cleaned that one out light is gone! i have drove 250 miles since and have not seen the light! Im so happy to say I have finally beat the annoying light! Big shout out and thank you to Painless for helping me and sending me the EGR part of the service manual! 2 Link to comment Share on other sites More sharing options...
gathermewool Posted October 15, 2021 Share Posted October 15, 2021 Great to hear! '15 FB25 Magnatec 0W-20 + FU filter (70,517 miles) RSB, Fr. Strut Bar, Tint, STI BBS, LED er'where Link to comment Share on other sites More sharing options...
Cancer Man Posted April 11, 2023 Share Posted April 11, 2023 On 10/14/2021 at 1:34 PM, Kenwarth said: Yep the valve is good after checking that i spent a long time removing the bottom egr pipe due to its location it was a pain to get off but its turns out that was also clogged and after i cleaned that one out light is gone! i have drove 250 miles since and have not seen the light! Im so happy to say I have finally beat the annoying light! Big shout out and thank you to Painless for helping me and sending me the EGR part of the service manual! Great!!! Link to comment Share on other sites More sharing options...
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