lmdew Posted December 29, 2022 Share Posted December 29, 2022 2016 Forester, Had a lean on #4. I forget the code but it pointed to the O2 sensor or MAF. Nephew changed the to a Denso unit. Mileage dropped from 24 to 16. He swapped the original back, but mileage is still down. I told him don't troubleshoot with the parts cannon. MAF was the only thing he could get over the holidays in time. Is there a good Free OBDII app we could download on his phone to see the fuel trim and O2 sensor readings. Thanks, Larry Quote Link to comment Share on other sites More sharing options...
Daskuppler Posted December 30, 2022 Share Posted December 30, 2022 On 12/28/2022 at 6:31 PM, lmdew said: 2016 Forester, Had a lean on #4. I forget the code but it pointed to the O2 sensor or MAF. Nephew changed the to a Denso unit. Mileage dropped from 24 to 16. He swapped the original back, but mileage is still down. I told him don't troubleshoot with the parts cannon. MAF was the only thing he could get over the holidays in time. Is there a good Free OBDII app we could download on his phone to see the fuel trim and O2 sensor readings. Thanks, Larry Nothing free that I know of. I use the Innova 5610 scanner, it works best week on Subarus and is available on Amazon. Quote Link to comment Share on other sites More sharing options...
heartless Posted December 30, 2022 Share Posted December 30, 2022 On 12/28/2022 at 7:31 PM, lmdew said: 2016 Forester, Is there a good Free OBDII app we could download on his phone to see the fuel trim and O2 sensor readings. Thanks, Larry there are lots of apps, but you still have to have a dongle to plug into the OBDII port to transfer the info to the app .. that dongle wont be free. Quote Link to comment Share on other sites More sharing options...
brus brother Posted December 30, 2022 Share Posted December 30, 2022 (edited) any new codes? disconnect battery and let the computer relearn? Edited December 30, 2022 by brus brother Quote Link to comment Share on other sites More sharing options...
lmdew Posted December 31, 2022 Author Share Posted December 31, 2022 No new codes. They are on their way back to WA. Gas mileage is a little better. Subaru MAF back in. Quote Link to comment Share on other sites More sharing options...
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