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brian s
Dodge Dakota
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12/24/2005
09:16:00
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 Subject: help with error code
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Any ideas on how to fix the error code p0171 for a 2000 dodge dakota 4x4 v8 magnum. I just bought this truck and it has 97k miles on it and stills runs good but kinda worried with enigine light on.
thxs alot
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jim
Dodge Dakota
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12/24/2005
16:57:16
|  RE: help with error code
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P0171 code is a report of a lean condition on Bank 1. I think Bank 1 is the left side. I have had this code a couple of time after a fast acceleration. It seemed to happen when I was having trouble with the front left oxygen sensor. Since fixing that problem I no longer see this code.
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brian s
Dodge Dakota
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12/24/2005
17:05:47
|  RE: help with error code
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does the oxygen sensor decrease fuel mileage?
seems like i have a hole in my tank lol because the gas is gone as quick as i put it in thxs jim for advice
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dickc
Dodge Dakota
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12/24/2005
22:49:20
| RE: help with error code
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After the O2 sensors heat to a certain temperature they are the primary source of information that the PCM uses to schedule fuel to the engine. An O2 sensor indicating lean will cause the PCM to increase fuel flow through the injectors. If an O2 sensor consistently indicates lean it could cause increased fuel usage.
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Red99DakR/T
Dodge Dakota
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12/24/2005
23:30:25
| RE: help with error code
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P0171 The oxygen sensor is saying that the system air/fuel mix is far too lean (too much fuel is being added as a correction). The O2 sensor going bad will mess up the fuel milage. The question i would have is if the problem is with the upstream or downstream O2 Sensor. What I would do first is take the O2 Sensors out and clean them up, put them back in and see if that changes things. If there is too much of a buildup of carbon on the O2 sensor, it will give a lean reading.
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brian s
Dodge Dakota
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12/25/2005
08:45:31
| RE: help with error code
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i will try to clean them because i only getting like 9 mile to the gallon at 55 mph and if i go up a hill it drops to 4 mph. i have a computer {optional} on this truck that tells me how many miles till empty etec etc and it'll say 100 miles till empty but i go 6 miles and it drops like 15 or 20 . all i know its killing my wallet
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Angel Lynn
Dodge Dakota
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12/29/2005
15:19:21
|  RE: help with error code
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my truck just gave me the same error code last night thanks for the help guys now I can fix it befor I go snowboarding tomorrow. this was a great place for help.
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JerryM
Dodge Dakota
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12/29/2005
23:32:56
| RE: help with error code
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I cleaned the drivers side pre-cat o2 sensor with contact cleaner on my 2000 4.7 liter, but ended up replacing it. I would recomend soaking the threads down first with some good penetrating oil and only use a box end, not open end wrench.
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brian s
Dodge Dakota
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12/30/2005
18:31:03
| RE: help with error code
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thxs so much for the help guys the o2 sensor was bad but it was not even tight. and was just rigged up 2 work. i bitched to the car lot and they agreed to cover it,which was 219 since they failed to catch it during their 100 point inspection well i guess now it's 101 lol. my gas milage went from 6.5 a gallon to about 16 i guess thats good since it is a v8 4x4.
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Redfelt
Dodge Dakota
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1/02/2006
16:41:18
| RE: help with error code
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I cant seem to find the sensors, what should I be looking for
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daddio
Dodge Dakota
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1/02/2006
16:51:17
| RE: help with error code
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the O2 sensor/s will be in the exhaust piping before and after the cat con.
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Redfelt
Dodge Dakota
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1/02/2006
17:38:18
| RE: help with error code
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I have the post cat sensor out of the pipe. Looks black and ugly how does one clean the sensor? Should I disconnect the wire? I am reluctent as the connection is atop the cat and i cant see it an am not sure how it connects
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JerryM
Dodge Dakota
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1/02/2006
17:52:05
| RE: help with error code
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Red,
I have a 2000 4.7 liter and replaced the drivers side pre cat o2 sensor. You say you have it removed but did not disconnect it electrically. Guess you turned it out and allowed the wires to twist in the harness.
Do this, follow those wires and the harness up and you will find one of those black plastic connectors holding the wiring harness to the chassis. Remove this and it will allow the wiring harness to drop down and up inside the harness is the 2 wire electrical connector for the o2 sensor. Not to hard to remove once you get under there and see what I mean. Also when you pulled out the o2 sensor, was there any oil or fluid coating the wires. If so, this is your main problem.
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Redfelt
Dodge Dakota
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1/02/2006
17:57:42
|  RE: help with error code
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Thanks Jerry,
The wires twisted a bit but are okay, the sensor itself is coated with carbon and dry no oil, once out what do I clean the sensor with? Brake kleen, soapy water......
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JerryM
Dodge Dakota
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1/02/2006
18:11:58
| RE: help with error code
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Message:
Red,
Brakeclean will work, also use a little dab of anti-sieze on the threads before installing. It will make it easy to remove in the future if you have too.
When I mentioned oil, I meant not on the sensor but on the wires in the harness.
I have read several posts and this problem occurs a lot with these Dodge engines. On the power steering pump discharge line is a pressure switch that blows and leaks steering fluid down the wires and harness to the o2 sensor.
Hard to believe but it happens and causes the engine to run rough with black soot coming out the exhaust.
You might want to be safe and check this switch to be sure. Very easy to get to, drivers side engine compartment off the power steering pump discharge line. Pop off the electrical connector and see if the switch blew and leaked fluid inside the connector. Good luck
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Redfelt
Dodge Dakota
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1/02/2006
19:19:30
| RE: help with error code
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Thanks again,
Sensors back in place and seem to be ok.
Down from the steering pump black knob with wires on it, is that it. if so how does it come off? It looks as though its a twist off or so.
Could this be why I get code P0551. The fluid level was low. Hmmmmmmm....
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JerryM
Dodge Dakota
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1/02/2006
20:01:59
| RE: help with error code
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Sounds like you found the switch and connector, right next to the battery. 2 wire connector, one black wire and one green/orange wire.
connector has 2 tabs, one on the top and one on the bottom. Squeeze them both with your thumb and forefinger and pull straight off, no twisting.
check for oil inside the connector, but bet you will. If so the switch is bad and will need to be replaced. I bought a new one for about 15.00 from the dealer and replaced it myself.
As I said this oil travels down the wires and ends up at the o2 sensor wires, giving bad readings. Take some electrical contact cleaner and spray out the PS switch connector and also the o2 sensor wiring and you should be ok, also top off the PS reservoir.
sounds crazy but I have seen several posts about this switch going bad and coating the o2 sensor wires.
took me about a week to figure out.
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Redfelt
Dodge Dakota
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1/03/2006
13:47:14
|  RE: help with error code
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Well as a non mechanic guy i am having a frustrating time. I removed and cleaned the O2 sensors, slapped em back in and there was no change in performance. Wpould I assume I need to replace them?
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JerryM
Dodge Dakota
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1/03/2006
17:54:04
| RE: help with error code
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You might want to go to a reputable shop, but have them definetly look at the power steering pressure switch. I still think this might be your main cause of the problem.
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Redfelt
Dodge Dakota
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1/04/2006
10:35:56
| RE: help with error code
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The switch is on back order 40.00 CDN
I will give the sensors a second shot after replacing the switch and cleaning around the sensor wires.
Thanks for the help, got a quote to remove and replace sensors for 360.00 CDN, I hate paying someone else to do repairs, learn as I go...
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Richard
Dodge Dakota
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9/02/2010
17:30:24
| RE: help with error code
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Message:
got 2 trouble codes po155 and po135 bot sure which of four sensors to replace. Parts guy gave me a pre-cat and a post cat. all sensors are pre-cat. factory headers.I'm lost...
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