Last post on Jul 07, 2013 at 9:26 PM
You are in the Dodge Durango
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Dodge Durango, Dodge, SUV
#664 of 853 Re: All 2000 Durango 4.7L Owners [srhoffman]
Feb 07, 2009 (12:40 pm)
I don't have an answer. But in respect to all those other 2000 4.7L O2 sensor sufferers in this forum, all of us out there that are checking emails for incoming edmonds forum to see if someone has answered this question. All of us that have attempted to install this harness bypass have asked it. If you have a willing and more competent parts dept person than I do at your local dodge dealership, they may be able to get the schematic and installation instructions. As for the smog cert, you may have some grace period for registration tags out of date, Pay the registration fees on time without the smog cert indicating you are in the process of smog repairs. You can get a 90 day grace in most states. Check for your state.
A warning to anyone going to the dealership for repairs- you go to them with these symptoms and they will charge hundreds even $1000+ replacing o2 sensors, doing fuel injection flush treatments, or replace injectors at $100+ each, or worse. None of this fixes the problem. It has to do with Power Steering (PS) fluid contamination from PS sensor failure, and leakage of the fluid into the harness ground wiring. PS fluid contaminated ground wires cause the PCM (Power Control Module) to send bad signals to systems like the fuel injectors, idle speed control,.and the problem child -the right bank upstream O2 sensor. The weak O2 sensor ground signal is interpreted by the PCM that an overly lean condition is in the right bank of cylinders. The PCM then sends long and short term fuel trim messages to the right bank of fuel injectors sensors to increase fuel mix to max rich causing soot and mileage drop. If you have this problem those are the problem codes the OBD2 will show. (right bank to lean, slow response on several fuel injectors, R bank O2 sensor signal delay) When the car is cold the sensors are inactive and defaulted at 0% which is a clean burning efficient fuel mix.
The whole problem begins with a loss of PS fluid and idle speed variations due to the initial PS switch failure. This occures long before the O2 sensor finally fails. Maybe early detection of PS fluid loss and timely replacement of the PS sensor could save some from this disaster.
Waited too long? there is hope- as I mentioned a simple unplugging of the upstream (from the cat) O2 sensor will bring the operating function back to normal. The PCM signal will stay at zero default mode which won't hurt the car. Gas mileage soot and performance will seem better than they have been for a long time. I went from 14.7 average MPG before the O2 failure. Suddenly I'm down to 8MPG when the problem hits, I now get about 16 average MPG. My engine light is on and because of the this it would not pass a smog test - if that is an issue for you at least you can continue operate the vehicle as normal until you get ti fixed.
I spent over $500 at the dealer for sensors and harness bypass install. They didn't install the harness saying I didn't need it. They didn't install it because THEY DON'T KNOW HOW. The part comes with no instruction or diagram.
I would sure like to see the solution posted on this forum. I will keep checking edmonds and waiting. For all those who don't have to worry about smog certs. and haven't already done so, replace the PS switch (30 bucks and real easy). Leave the new PS switch unpluged- it will just get recontaminated. runs fine unplugged. idle speeds are the best in years,- (PS switch sends to PCM to control idle speed -unplugged defaults to a steady 700rpm). The new PS switch will also stop any PS fluid leak. Finally unplug the upstream right O2 sensor. Secure all loose connector ends with plastic ties away from heat and harms way of the fan belt and exhaust pipe. Your car should run fine unless you have something else wrong. Smog certifiable aside, at least you can use your car without damaging cylinder walls, valves, and the cat. Peace
#665 of 853 Re: 2001 Durango with no parking lights, plate lights, or dash lights [JHayner]
Feb 19, 2009 (12:35 pm)
I had a problem with my 98 jimmy and come to find out it was the dimmer switch, I replaced it and everything is fine try that it is simple and cheap from a junk yard. Thanks Ed 98 Dodge Durango/98 GMC Jimmy
#666 of 853 Re: starts and dies! [mbradbury]
Feb 19, 2009 (9:23 pm)
if that didnt help! have the manul for the 98 99 durango,dakoda it has a list of stuff. Incorrect idel speed,Fuel filter clogged and or water and impurities in fuel, Fauity fuel system or sensors,Fauity plug or plug gap or wiers, Vacuum leak at throttle body,intake manifold or vacuum hoses
be happy to give whatever help i can from book or my own exp.
#667 of 853 Dodge Durango O 2 Sensor!!!
Mar 03, 2009 (4:33 pm)
dont know if anyone has thought about it, but my check engine light came on yesterday, and it says that it was the CAT! so my hubby reset it all and I drove it about 100 miles before I went to get it inspected today, ( had doctors appt an hr away)... anyways, right before I pull in, the light came on again!! MY LUCK!! so off to the shop we go, they replace the O 2 sensor and send me on my way, less than a mile down the road, BOOM!! Check engine light on again, still getting the same reading as before!! So, get my oldest from school and back to the shop we go...... MY O 2 SENSOR WAS FINE,............ ITS THE O 2 SENSOR RECEPTACLE..... it is damaged and we have no idea how, probably for the fact that it is almost 11 years old, LOL!!! so please, when you go in to have that sensor replaced, have them check the receptacle and save yourself some money!!!!
#668 of 853 Re: All 2000 Durango 4.7L Owners [mucuna]
Mar 04, 2009 (3:51 pm)
Should we be thankful that we're not alone in this dilemna? I have suffered the same symptoms and thanks to this site, saved hundreds or thousands on repairs. I disconnected my O2 sensor and my truck has run fine. Engine light stays on, of course. I live in a rural area so no need to worry about passing the emissions test. Was wondering though, if so many of us are having this issue, what does it take for dodge to realize it? I think there should be a recall.
#669 of 853 Re: o2 sensor + power steering pressure switch Dodge Durango Nightmare [julia1974]
Mar 06, 2009 (7:58 am)
I have a 2000 Durango with this very same problem. Unfortunately, like many others I had to fiure it out myself as Dodge is no help whatsoever. I am a DIY'er, because I cannot afford the incompetance that most dealerships provide. My problem started back in 2007. I figured out the power steering switch link to the failing oxygen sensor, but like a lot of people, I still have gone through several sensors due to residual fluid in the wiring harness. Luckily, I have not needed the truck much since I only use it to pull a boat. But I cannot pass emmissions until the problem is fixed, and thanks to our state's new laws, I have been fined $50 for exceeding the inspection period. I have decided to tackle the problem and hopefully provide specifics: i.e. wire colors, locations, etc. so that anyone else who cannot afford dealership BS and runaround can have a solution to this problem. It has been mentioned in these posts before, but from what I have found, disconnecting the front O2 sensor will make the truck run much better if you are having the low MPG/black soot problem. This is caused by a faulty O2 signal caused by the power steering fluid contamination. When you disconnect the O2 sensor, you will get a fault, but it will put the computer (PCM)in a default mode that basically assumes the sensor is dead and will ignore the signal (or lack therof) and instead rely on a preprogrammed algorithm to make up for it. It is not the optimal settings, but you will get 15-16 MPG instead of 4-8, as you should not have the heavy black soot at the tailpipe anymore. For those of you who do not have to deal with a OBDII emmissions inspection, this is really all you need to do since the default program is almost as good as with the sensor (I personally cannot tell a difference). Unfortunately for those of us with emmissions, we have to fix it. I started my repairs last night, and hope to report back soon with specifics for all the DIY'ers out there if it has not already been posted here.
#670 of 853 2002 Durango 5.9 starting problem
Mar 09, 2009 (5:53 pm)
My durango won't start. It cranks over but no start. The fuel pump comes on and I get 45lbs of pressure at the fuel rail. I sprayed carb cleaner in the air intake and nothing. I hit the gas tank with the back of a shovel and nothing. I'm lost! People say it's the fuel pump ,but I have doubts. Any help!!!!!
#671 of 853 Re: o2 sensor + power steering pressure switch Dodge Durango Nightmare [ncdodgeowner]
Mar 11, 2009 (4:57 pm)
Good luck. The moment I have been waiting for. I hope your method includes using the dodge harness bypass. This problem was remedied by dodge but no one including the dealer repair techs have a clue. It is incredible that I couldn't get competent service to get this fixed at my dodge dealer. I tried to tell them what the problem was. I pre-ordered the harness bypass. The corporate auto service division knows about the problem. They made a part to bypass the problem for crying out loud. But somehow the huberous nature of the service department mechanics they "assume" every common problem except what is really wrong with the car. I burned 1300 bucks total on needless repairs including replacing all 8 fuel injectors, 2 O2 sensors etc (no wonder Dodge doesn't bother to do anything about the real problem!). They denied my explanation of the problem and quoted me another 800 bucks to do exhaust repair PCM module replacement and on and on.
When I finally realized I was going to have to tackle fixing it myself, I found it outright scandelous that I can't find out how to install the harness bypass from my dodge dealership, from Dodge corporate, or from any other Dodge source- internet included. In fact this site is the only place this information is being discussed. This is a unique problem to the 2000 4.7L. In 1999 they didn't have a power steering switch (sensor) and by 2001 they fixed the PS design flaw. I agree with Julia there should have been a recall but it doesn't appear one was ever issued. Instead they just threw the replacement part out there and gave no direction to the dealerships to alert the mechanics, parts people, or the public. And we wonder why GM and Chrysler are tanking?
#672 of 853 Re: o2 sensor + power steering pressure switch Dodge Durango Nightmare [mucuna]
Mar 12, 2009 (5:16 am)
I am not using the Dodge Bypass Harness. Given what I have read about it, and the cost, I am simply making a bypass harness myself. I have not seen it, but I assume that the harness offered by Dodge has to be "hard-wired" in to the wire bundle leading to the PCM. I have positively identified the signal wire in the main bundle. It is light green with a red stripe. Unfortunately there is more than one light green wire with a red stripe in the bundle. The other one goes to the transmission. I ended up cutting both to figure this out. There is also an isolated signal ground that is black with a blue stripe. Again, there is more than one of these, so getting the right one is an arduous task. Once I identified both of these, I was able to simulate the signal and watch the Fuel trim response in the PCM with a code reader. I determined that my O2 sensor was bad (another one) so I was unable to complete the hookup just yet.
I purchased a Bosch "Universal-fit" O2 sensor, but am skeptical if it will work, because I have read (and measured) an excitation voltage of 4 volts on the signal circuit. What I have read is that this voltage is part of a 'diagnostic function' that Dodge came up with to test the sensor, and only a Dodge O2 sensor will pass, otherwise setting another code/engine light. I am going to try the Bosch sensor in this setup first, since it is half the price of a Dodge sensor, and see if it works. leave it to Dodge to not only send out a defective vehicle, but make proprietary parts for it as well.
I am going to try this over the weekend and will report back with results. Once I get it all right, I will try to provide more information since Dodge has again "Dodged" the responsibility. By the way Chrysler, I will never buy another of your products, and hope your company folds so we can get junk like this out of America.
#673 of 853 Re: o2 sensor + power steering pressure switch Dodge Durango Nightmare [ncdodgeowner]
Mar 14, 2009 (10:48 pm)
from what I under stand it is only the ground wire that gets contamintated because of a common connection it shares with the power steering ground. It looks like the o2 sensor and PS ground wires join and are connected in the harness about 4- 6 inches above where the upstream sensor wire branch come out. From earlier messages once the PS fluid reaches the o2 sensor connection it can then leak from the ground wire on the harness side into all four wires on the o2 sensor side because of the exposure created at the connection. This can ruin or foul the o2 sensor, the wiring and the connector when you remove and try to test it. I don't know if there is a way to get the PS fluid out of the wires. Other repairs posted involved cutting the connector on the harness side of the o2 connection, replacing all four pins on the harness side of the connector, and bypassing the contaminated ground wire by rerouting an new ground from the o2 sensor to the common ground on the engine block below the water pump.