I'm rebuilding that 2004 F150 Salvage truck. We got it all together and got it driving tonight. It is having problems idling right, and will stall a lot. We pulled the code and got a P2195 code. We cleared the code, drove it around my neighborhood and didn't get it back, but it still stalls. Any ideas on what is causing this. We don't have the muffler on yet. I"m thinking this may be causing it. Should I take it to Ford and have the comptuer re-flashed??

 

P2195 indicates a correlation fault between TP1 and TP2 reference points with the electronic throttle control system. Look for pinched wires at the TPS, a faulty TPS itself, or a faulty PCM.

Disregard; Asinatra has the right idears...

 

Info below is correct. I had it mixed up with p2135. Check for damage to o2 sensor or wiring. Good Luck.

 

This is strait from ford...

Diagnostic Trouble Code
P2195 - Lack of HO2S-11
Switch, Sensor Indicates Lean

Descriptions
A Heated Oxygen
(HO2S) sensor
indicating lean at the
end of a test is trying
to correct for an overrich
condition. The test
fails when the fuel
control system no
longer detects
switching for a
calibrated amount of
time.

Possible Causes
􀁺 Electrical:
􀁺 Short to VPWR in the
harness or HO2S.
􀁺 Water in the harness
connector.
􀁺 Open/shorted HO2S
circuit.
􀁺 Corrosion or poor mating
terminals and wiring.
􀁺 Damaged HO2S.
􀁺 Damaged PCM.
􀁺 Fuel System:
􀁺 Excessive fuel pressure.
􀁺 Leaking/contaminated
fuel injectors.
􀁺 Leaking fuel pressure
regulator.
􀁺 Low fuel pressure or
running out of fuel.
􀁺 Vapor recovery system.
􀁺 Induction System:
􀁺 Air leaks after the MAF.
􀁺 Vacuum Leaks.
􀁺 PCV system.
􀁺 Improperly seated
engine oil dipstick.
􀁺 EGR System:
􀁺 Leaking gasket.
􀁺 Stuck EGR valve.
􀁺 Leaking diaphragm or
EVR.
􀁺 Base Engine:
􀁺 Oil overfill.
􀁺 Cam Timing.
􀁺 Cylinder compression.
􀁺 Exhaust leaks before or
near the HO2S(s).

 

Dammit, I did the same thing. Force of habit.

 

Any idea on how to test if I have a bad sensor?? Would this be the upstream sensor or the sensor closest to the Cat converter? Could this be caused because the muffler and exhaust system is off? We have everything disconnected after the CAT.

 

Also, I have the fuel cap off. Would this cause it?

 

Also, thanks much for the help.

 

1-1 is passenger's side, upstream. For whatever reason, it's not switching from rich-lean-rich-lean, it's stuck on lean. Make sure the wiring isn't damaged or twisted up.

No gas cap would cause P0455 or 457, gross evap emissions leak.

 

Great, I suspected that may be broken. When assemblying it, I noticed that it was slightly bent. I guess it got hurt in the accident. I didn't swap it out and took a chance that it was ok, I guess not.

I also got a p0174 code. Any idea on that one?

 

Bank 1 lean, probably related to your HEGO problem.

 

Great, I'll try to tackle this tonight

 

For what its worth...the lack of back pressure caused by not having a muffler on could cause the O2 sensor to read a lean condition as well. Its probably not the cause in this case if the 02 sensor is damaged but if replacing it doesnt fix it try putting the muffler on and see if it still does it.

 

OK, maybe I'll try putting the muffler on first. Is there anyway I can test that O2 sensor?

I'd hate to buy a new one if that one is OK. When I looked at it, it was just slightly bent, which is why I kept it in. The harness was also cracked, but I glued that up pretty well. I'd also hate to replace the sensor if that harness isn't making a good connection.

 

You really aren't supposed to repair the harness on the O2 sensors or alter the wiring in any way, since this is how the O2s get an outside air reference to compare, through the harness opening. If for whatever reason it's damaged, replace it.