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Old 04-18-2010, 09:22 PM
MCGA MCGA is offline
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Unhappy 03 Expedition: Codes P2195, P2197 and P0171

I have a 03 Expedition, 2x4, 4.6l engine w/ 101K miles. It has had a problem with a rough not quite grinding noise when it gets warm. It sounds like it was coming from underneath the drivers seat. I thought it was most likely the exhaust or catalytic converter area. I thought it was a rattle, but Saturday the check engine light came on and it was idling real rough (almost cutting out) and surging. I immediately thought O2 sensor. That is where my knowledge and experience stops. Took it to Autozone, and the following codes came up: P2195, P2197 and P0171. All of these pointed to the O2 sensors. My questions are as follows:

P2192 says "Lack of O2 sensor - Bank 1, Sensor 1"
P2197 says "Lack of O2 sensor - Bank 2, Sensor 1"
In my lack of time I replaced the front "up stream" sensors on the right and left. I still have the surging and rough idle! Where is Bank 1 and Bank 2? I assumed that since they both said sensor 1 I assumed they were the ones before the catalytic converter. Am I correct with O2 sensor?

I was also assuming that the P0171 was related to the bad O2 sensors. I have read that O2 sensor is often misdiagnosed for P0171.

Any direction will be greatly appreciated!

Thanks!

Mike
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Old 04-19-2010, 11:47 AM
alloro alloro is offline
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You have a large vacuum leak, probably the PCV elbow at the top rear of the engine.
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Old 04-19-2010, 09:35 PM
MCGA MCGA is offline
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Found what I think is PCV...

I think I found the PCV elbow. The elbow was sucked in... I s this it? I pulled the hose off, and there was a small hose on the unit that teh rubber hose was attached to, and I pulled it off. Water or some other fluid cam pouring out of the hose and the plastic piece that the rubber elbow is attached to. Is this the PCV? How do I change the rubber elbow, it appeared to be attached to the non-hose end in a way that it won't come off. There does appear to be a hole in the rubber elbow in the area that is sucked in. Appreciate your help!
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Old 04-19-2010, 09:41 PM
alloro alloro is offline
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Compare what you found to the images on this page to see if you have the right thing.
1998 Ford Expedition Vacuum Assembly
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Old 04-20-2010, 06:10 PM
MCGA MCGA is offline
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This seems to be a reoccurring problem on this board. If only we would write the same thing so the search would pick up exactly what we needed. Oh well, it would be a boring message board!

Anyway, got it fixed! It was the rubber 90 degree elbow at the very rear of the manifold. Still don't know if it was the elbow for the PCV, MAS or the ABC valve. Anyway, I couldn't make it to the Ford parts shop, so I went by AutoZone and they only had an elbow the same size in a radiator bypass hose. It is on and no air is leaking around it. Is is only to leave this type of hose connected, or should I get the more flexible rubber one from Ford?

Anyway, THANKS to allpro!!!!!! only wish I had found it before I replaced teh 2 up stream O2 sensors. With a 101K miles I guess they needed changing anyway.

Thanks again!

Mike
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Old 04-20-2010, 07:28 PM
alloro alloro is offline
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Quote:
Originally Posted by MCGA View Post
they only had an elbow the same size in a radiator bypass hose. It is on and no air is leaking around it. Is it okay to leave this type of hose connected, or should I get the more flexible rubber one from Ford?

Anyway, THANKS to allpro!!!!!! only wish I had found it before I replaced teh 2 up stream O2 sensors.
If it works, stop fixing it. LOL
Who's "allpro"?
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Old 04-21-2010, 03:58 PM
MCGA MCGA is offline
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Sorry!!!

Thanks to alloro!!!!! No truer statement said...."If it works, stops fixing it"!
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Old 09-02-2010, 12:05 PM
ncdac875 ncdac875 is offline
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04 Expedition Codes P2195, P2197, I had the same problem with the vaccuum assembly 90 degree hose being worn out and deteriated. I just want to say thank you guys, you saved me a lot of money.
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Old 06-10-2012, 03:43 PM
RoundRockMike RoundRockMike is offline
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Thumbs up

Thank you, thank you, thank you!!! My '03 Expedition has 97K miles on it and just threw these 3 exact same codes. I reached to the back of the intake and found the problem immediately after reading the info on this thread. 30 minutes and $5 later, the problem is fixed.
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Old 07-23-2012, 01:40 PM
John XL John XL is offline
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I appreciate this forum indeed. I reach around the back and found huge hole at the elbow. after changing hose, truck not turning off while idling however, its still sputtering during acceleration.
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Old 07-23-2012, 10:21 PM
RoundRockMike RoundRockMike is offline
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Smile

I also noticed the same thing. Even though the codes didn't come back, it wasn't running great. Going up hills it was sluggish and you could feel the hestitation at full throttle. Took it to the dealership to have the spark plugs and fuel filter changed, since we did have about 97K miles on it. The problem seems to be fixed for good now. No hesitation and better gas mileage.
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Old 07-23-2012, 10:21 PM
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03, 150, 1998, 2003, 2004, 2195, catalaytic, expedition, explorer, f150, ford, mountaineer, p0171, p2195, p2197

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