2004 Ford Focus P2195 Code: Lean Mix Issue, Vacuum Leak or Fuel Pressure Problem?
This is my first time posting on a forum — I'm now considering visiting a repair shop for $$$$ work! I've already replaced the O2 sensors, MAF, TPS, and IAC, but after about 10 minutes of idle, the car starts to run roughly and eventually stalls. It runs smoothly while driving, but not at idle. I haven't replaced the EGR yet. The vehicle has 130,000 miles on it. Any ideas? I've checked for vacuum leaks — seems fine. The original alternator is still in place. The Check Engine Light (CEL) came on two years ago but the car ran great until about three months ago when the idle roughness started. I'm completely out of options now and feeling overwhelmed.
If you're ignoring a known issue like the CEL being on, you won't be alerted to new problems — so when was the last time you pulled codes? P2195 indicates a lean mixture condition, which is often caused by vacuum leaks. Try the old spray bottle trick (spray carburetor cleaner near suspected leak points) to test for leaks. Also check the PCV system and components downstream of the MAF sensor. Low fuel pressure can also cause a lean condition — especially during colder weather when optimal fuel pressure is critical. It's actually more cost-effective to have a professional diagnose and fix the issue rather than replacing parts randomly. Doing so can quickly become expensive, and some inexpensive parts may even introduce further problems.