Originally Posted by pcordes1979
Alright today on my way home from my last service call today my trusty 2006 ZXW w/ 222K miles on it developed a severe driveability issue and threw the P2195 code relating to extreme lean condition.
To me it seems like a lack of fuel (possible fuel pump failure?) as even in neutral when i press the accelerator the engine will rev up and down from 1000 to 3000 to 1000, and at idle the engine will die in short order unless I press on the gas. I could be wrong though I have tried disconnecting the main O2 sensor to take that out of the mix and force open loop no change. When I used Forscann to read the fuel pressure the pressure was around 38-40psi. For a few weeks now I had been getting a P0171 lean condition DTC but didn't have any apparent driveability issues.
In the morning I will try swapping changing the fuel filter as it has been well over 100K miles since I changed it. I checked the various vacuum hoses and they all seemed intact. Tried searching the forum and none of what I found seemed to pertain to the exact issue I am having. I just hope it isn't the fuel filter as I had just filled up in the morning but the problem didn't happen until 85-90 miles and 5 hours later. Also no codes relating to a misfire or anything else, just the P0171 which got superseded by the P2195 code.
Any advise will be greatly appreciated!
38-40 psi relative fuel pressure is normal/correct. Just curious - when was the last time your Focus had new O2 sensors? Have you looked at the O2 sensor voltage output in scan tool live data? Lean condition can be lack of fuel or too much air (leak). What are your ST and LT FTs?
2005 ZX4 SE 2.0L Duratec 5-speed 191K miles
2002 Wagon SE 2.0L Zetec 5-speed 135K miles
Last edited by Paul1958; 04-26-2019 at 12:01 AM.