Dodge Ram Normal Rear O2 Sensor Reading
Need Help! - low reading on downstream 02 sensor - 07 dodge ram 1500 -
05 Dec 2017 20:27 - 05 Dec 2017 22:43 #15581 by jb13
Hey everyone, I have a 2007 dodge ram 1500 with the four.7L v8 in it. I am having an effect that I am hoping that someone with more than knowledge can help me with. I recently got the code p0430 check engine light come on in my truck. The lawmaking is for inefficient catalytic converter bank two. subsequently talking to multiple sources and doing inquiry, everyone said that there is a 90% chance that the converter is bad and would need to be replaced. I replaced the converter and the code came back on the same twenty-four hour period. I furthered investigated this upshot by using my scanner and looking at the voltage of the 02 sensors on both banks of my exhaust. When I did this, I noticed that my downstream sensor on bank two was acting weird at start up and while driving it. The downstream sensor has the same voltage equally the other sensor earlier I commencement the truck, but once I start the truck the sensor loses nearly of its voltage within a infinitesimal or so. Sometimes the sensor with show 0.035 or so volts just nothing compared to the same sensor on bank 1 which is .685-.7 ish. When I bulldoze the truck on the interstate the sensor volition sometimes show flashes of it working......if I accelerate on the throttle it volition spring upwards and match the bank one sensor 2, only then it will fall dorsum down. The upstream sensor is working in the aforementioned style as the bank ane upstream sensor so it can not be that sensor causing the issue. I figured that I accept a bad 02 sensor since I am losing voltage at startup and then I replaced the depository financial institution 2 sensor with a new ane. I collection it on the interstate and it still did the same matter......I included a live data chart in this post to try and show what is going on....the cheque engine lite did not come dorsum on simply information technology did same "awaiting code" on my scanner and it was the same p0430 lawmaking.....
It is now clear to me that at that place is a communication problem with the pigtail that connects to this sensor. There is either a trouble with the computer on the truck with this sensor (which seems unlikely to me since all of the other three sensors work) or there is a problem with one of the wires going from the calculator to the pigtail. It does non appear to have whatever cuts or burns in the wires as far as I can run into.
I am non sure what I need to do adjacent.....I do not know where/how to test the wires or meet where the ground is for the pigtail. I have tried to discover more than information but accept had no luck. I exercise non want to take it to the dealer and pay a lot of coin to merely take them look at information technology....they volition probably assume its a bad reckoner and charge a lot of money to replace it..
Some aid in the right management would be bang-up! Cheers and then much!
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05 December 2017 22:eleven #15586 by Dylan
Welcome to the forum!
I'one thousand moving your thread to the repair department 
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06 Dec 2017 xi:41 #15599 by Ben
Hello jb and welcome ton the forum my get-go question is which side (left or correct as seen from sitting in the driver'south seat ) was replaced? Tin yous take a video of the 4 oxygen sensors and either post information technology hear or link information technology to YouTube? if and so then do it with a warm engine (full operating temp)
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06 Dec 2017 19:50 #15607 by cheryl hartkorn
any exhaust leaks? also do you take a scope or multimeter to compare actual sensor voltage vs what the scanner reads?? on chryslers the o2 sensors read v volts with cardinal on engine off nd before they go into airtight loop. what are the fuel trims on both banks?
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06 Dec 2017 20:04 #15610 by jb13
I will bear witness the voltage of each sensor in a video tonight. I was told that certain brands practice not work also as others. The one-time sensor in the truck was a denso brand. After I replaced the converter I kept the same sensor in at that place which read no voltage. And then I bought a new Bosch sensor which did the same thing. I but bought an OEM Mopar sensor today and will be putting information technology on shortly. I do non recollect that the OEM sensor will solve my problem but I figured information technology is my concluding resort......if I took it to the dealer and explained my problem I am sure they will charge me a crazy amount for ane. All of the three other sensors on the truck are denzo brand...
I do take a multi meter but it is a weird angle to try and test the pigtail. I volition give it some other shot with the multimeter. I will be posting a video in the next couple of hours with what my scanner is reading on all four sensors. Cheers!
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06 December 2017 20:11 #15612 by jb13
I open the mopar packaging and turns out the oem sensor is a denso. I was non expecting that......hopefully this helps
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06 December 2017 20:46 #15618 past jb13
and then the new OEM Denso sensor did the aforementioned thing that the other sensors have done. I did a screen recording of what is going on. At around 2 minutes in each of the videos I give the truck some gas to get the RPMs up......the 2d video I tried to show the fuel trims. if any more info/video footage is needed please let me know!
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06 December 2017 21:22 #15622 by Tyler
Thanks for the videos! Could nosotros also get a video with short and long term trims? Disregard those SHRTFT B1S2 and SHRTFT B2S2 - they'll never say anything but 99%.
Cheryl was asking about exhaust leaks, and I'grand wondering the same. To me, the sensor is behaving like there's a genuine excess of oxygen in the exhaust, so I'one thousand wondering where that may be coming from.
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06 Dec 2017 21:50 #15625 by jb13
Thank you for the quick feedback! Okay sure let me take a video of that for y'all guys.
Sorry I forgot to answer that question.....I also read that an exhaust leak could be causing the p0430 lawmaking and then that is also a possibility.....I guess I only assumed that since the sensor was not reading right and information technology has a new converter on it that the sensor is the last possible option......would the frazzle leak have to be around that downstream o2 sensor then? Just from a general expect downwardly at that place I accept no seen anything but it could be so pocket-size that I wouldn't be visible....
Will be uploading the next video shortly! Thanks guys
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06 Dec 2017 22:03 #15627 by jb13
heres the next video
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07 Dec 2017 22:55 #15657 by jb13
hither is the video of that you requested....I took it into the store today and they said there is a modest leak correct behind the converter! I am having it fixed tomorrow so I am hoping that the leak will solve the trouble with the sensor acting up. I'm likewise praying that the sensor is somehow causing that p0430 code and that there is nothing else wrong with the exhaust.....I tin can non see how the sensor could cause a converter inefficient lawmaking (especially since they accept trouble codes for 02 sensors) but I could be completely wrong on information technology. I will permit you guys know tomorrow if the repair solves all of my problems. I programme on getting it fixed and and then taking it for a drive around town and and so on the interstate
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08 December 2017 13:08 #15660 by jb13
the leak hole has been fixed and the sensor is nevertheless acting up.....not sure why....im guessing it is a connexion problem
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09 Dec 2017 xviii:56 #15688 by Tyler
That'due south disappointing to hear. 
I really hate to ask, but where did you get the replacement converter from? Considering information technology seems to me like the catalyst simply isn't storing oxygen at all, and is instead but dumping it right back into the exhaust.
If you want to bear witness out a connectedness issue, there are a couple options. One would exist to apply the 5V bias on the bespeak wire like Cheryl mentioned. The scanner won't show it due to OBDII standards, but those sensors showtime out at 5V cold, and become pulled down to 0-1V with heater operation. Y'all can measure out for this with DMM, and further cheque the O2 signal ground by shorting the signal TO the ground. If you see the bias become to zippo, then you know the basis is OK.
The other would be to disconnect the PCM and load the O2 wires with some kind of light seedling, or even an incandescent examination lite. It's work, merely it'll eliminate all doubtfulness well-nigh the wiring. We can provide yous with wiring diagrams and pin numbers if needed.
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09 Dec 2017 19:08 #15691 by jb13
It is a flowmaster converter on information technology now.....I actually am just guessing at this point.....
hither is a freeze frame of what my scanner shows when the cheque engine light came on.....if someone could permit me know if something is off that could lead me in some other direction that would be nifty.....
if not, so i will start trying to test the connections and see if I can discover the trouble with wiring..
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09 Dec 2017 19:32 #15693 past Tyler
I see nil off on the freeze frame, or in the fuel trim videos you posted before (thank you, BTW ). Really, those trims are pretty excellent, especially when the P0430 set. Zip to suggest there'south anything incorrect with the feed gasses to the converter.
This video expands on the 5V bias organization, if y'all're interested:
Also, this is the wiring diagram for both downstream O2 sensors:
I went back to the showtime video that you posted, with all 4 O2'due south during startup, and I gotta say... I don't come across an O2 performance issue. 
Y'all can tell that the B2S2 is new, as the fourth dimension-to-response is noticeably faster than the other sensors.
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09 Dec 2017 xix:37 #15694 by jb13
Cheers for the advice and the diagrams!
I'm going to expect into the wiring tomorrow and see if it helps my problem.
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