kalabala2005 Posted October 13, 2018 Share Posted October 13, 2018 Hi colleagues I need your help my car show this code and i dont know from where i can begain can anyone help me My car subaru legacy 2010 2.0 cc ej204 cvt I get code p0172 system too rich bank1 error Please need your help I take the car to dealear one one month ago and tgey say u meed change fuel pump and they already change it After 15 days error came again and they cant determine what is the problem !! Link to comment Share on other sites More sharing options...
cww516 Posted October 13, 2018 Share Posted October 13, 2018 I'd take a look at the spark plugs. If one of them is black (and maybe wet), that'd point to a sticky fuel injector at that cylinder, and if all of them look a little black, that could be a bad fuel pressure regulator. "Normal" is slightly brownish, you can come up with lots of examples by doing a web search for "spark plug color chart". Link to comment Share on other sites More sharing options...
YeuEmMaiMai Posted October 15, 2018 Share Posted October 15, 2018 other things that I would look at BEFORE tearing the car apart. 1. Fuel trims? are they pegged? 2. MAF, at idle fully warmed up it should be roughly 2.0Grams a second (roughly equal to engine displacement) 3. data log your O2 sensors. Most of the time it will be MAF failure or a vacuum leak in the system. Link to comment Share on other sites More sharing options...
kalabala2005 Posted October 31, 2018 Author Share Posted October 31, 2018 i take car to the dealer and he say that pcv valve was damaged and stuck on always open he change it and car now go normally and i have one small question A/F correction#1 range is from -20 till +20 on idle is this normal or i have air leak on the system and how to check air leak on my system ? Link to comment Share on other sites More sharing options...
YeuEmMaiMai Posted November 1, 2018 Share Posted November 1, 2018 with the car running fuel trims should be withing a few % of 0 ie -3 to plus 3... Link to comment Share on other sites More sharing options...
kalabala2005 Posted November 1, 2018 Author Share Posted November 1, 2018 with the car running fuel trims should be withing a few % of 0 ie -3 to plus 3... And how to know what is issue on my car ? Link to comment Share on other sites More sharing options...
hallowground Posted November 5, 2018 Share Posted November 5, 2018 Now that it is getting colder out I would make sure your maf sensor, throttle body and PCV valve are spotless. If you have 60-120k miles you could need a spark plug(highly recommend different swivels and extensions if doing yourself) Also I would only use Top tier gasoline in your car. Exxon, BP and Mobil have been known to have the best detergents mixed in with their gasoline. Oil may be the blood of the car, but they put any brand of gas in their car when they shouldn't. Sent from my SM-G935V using Tapatalk Link to comment Share on other sites More sharing options...
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