Land Rover and Range Rover Forum banner

1 - 20 of 34 Posts

·
Registered
Joined
·
1,334 Posts
Discussion Starter #1
Ok so I got a P161 code for 02 sensor L2 Rear signal below minimum. I'm assuming signal below minimum means too lean? Not sure.

I replaced the rear Bosch O2 with a rear Walker O2. The problem seems to have gone away now.

Any problems running 3 Boschs and 1 Walker on the rear?
 

·
Expert Crate Digger
Joined
·
161 Posts
Maybe no problems but I always swap O2 sensors in same pairs of NTK sensors.
 

·
Registered
Joined
·
195 Posts
There should be no problem mixing Walker and Bosch sensors as you have done.

But I will point out that the P0161 descriptions in the RAVE are "O2 sensor heater circuit malfunction (bank 2, sensor 2)" and "Rear sensor heater RH bank - short/open circuit." There is no reference to "signal below minimum" as you state, and it has nothing to do with the engine running lean.

Remember, the sole purpose of the rear, position 2, downstream O2 sensors is to monitor catalytic converter effectiveness. Ideally the voltage reading should remain very close to 450 mV, fluctuating more slowly and over a more narrow range than the upstream sensors.

I don't see an UltraGauge or something similar in your long list of modifications. Are you able to monitor O2 sensor voltages and other data while driving?
 

·
Registered
Joined
·
1,334 Posts
Discussion Starter #4
There should be no problem mixing Walker and Bosch sensors as you have done.

But I will point out that the P0161 descriptions in the RAVE are "O2 sensor heater circuit malfunction (bank 2, sensor 2)" and "Rear sensor heater RH bank - short/open circuit." There is no reference to "signal below minimum" as you state, and it has nothing to do with the engine running lean.

Remember, the sole purpose of the rear, position 2, downstream O2 sensors is to monitor catalytic converter effectiveness. Ideally the voltage reading should remain very close to 450 mV, fluctuating more slowly and over a more narrow range than the upstream sensors.

I don't see an UltraGauge or something similar in your long list of modifications. Are you able to monitor O2 sensor voltages and other data while driving?
I removed the cats and installed O2 spacers. I got the car registered in FL to pass emissions and get that badass vvrooom noise. Everything has been working fine until now.

I have an Ultraguage and a Nanocom. The UG is for the temps. All I know how to do with the Nancom is clear faults.

I swapped in a Bosch O2 sensor and am now getting a different O2 code for the same thing. Rear O2 Pipe #2 . And of course it immediately has to mess up how the engine runs and Hog an insane amount of gas.

If I could remove the entire emissions monitoring system I would.
 

·
Premium Member
Joined
·
1,412 Posts

·
Registered
Joined
·
195 Posts
I removed the cats and installed O2 spacers.
First you said you replaced a downstream O2 sensor. Now you say you removed the cats and installed O2 "spacers." What are O2 spacers?
 

·
Registered
Joined
·
1,334 Posts
Discussion Starter #7
Then you've spent money in vain for a very evolved diagnostic tool which is wasted... In Motronic - Inputs - O2 you can read live data of them, it's also explained in the user guide how the readings should be OK ... and from all the other sensors in the same section... just dont misunderstand things

for O2 is page 13 https://www.nanocom-diagnostics.com/downloads/preview/bosch-motronic-v8

O2 1 is 55
O2 2 is 1

That's all it says


I don't want to waste time reading instruction manuals. It should be simple and easy to use like Windows. If I knew I needed a 6 month course to learn it I would never have bought it.
 

·
Registered
Joined
·
1,334 Posts
Discussion Starter #8
First you said you replaced a downstream O2 sensor. Now you say you removed the cats and installed O2 "spacers." What are O2 spacers?


I removed the cats and resonator, installed a Flowmaster muffler, and installed 4 O2 spacers:

https://www.amazon.com/JGR-Defouler-Straight-Headers-Exhaust/dp/B07VDQRPJW/ref=asc_df_B07VDQRPJW/?tag=hyprod-20&linkCode=df0&hvadid=375249767987&hvpos=1o1&hvnetw=g&hvrand=2328969834646129133&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030795&hvtargid=pla-812143763163&psc=1&tag=&ref=&adgrpid=79352187760&hvpone=&hvptwo=&hvadid=375249767987&hvpos=1o1&hvnetw=g&hvrand=2328969834646129133&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030795&hvtargid=pla-812143763163


These are suppose to keep your CEL off for O2 codes. It ran great for a while. Now I'm getting over revving errors, Drive Train Errors, and downstream O2 sensor errors.
 

·
Registered
Joined
·
1,334 Posts
Discussion Starter #9
I don't see an UltraGauge or something similar in your long list of modifications. Are you able to monitor O2 sensor voltages and other data while driving?

I have way, way more mods. Easily double the list. The blue collar geniuses who made this website can't make a signature line longer than 700 characters.
 

·
Premium Member
Joined
·
1,412 Posts
It seems that a police scanner and a license plate concealer are more important to be mentioned than the other things which didnt appear then :serious
O2 1 is 55
O2 2 is 1

That's all it says
Then maybe you watched other scanner cos nanocom shows 6 values/page for each position(what you see for upstream is shown for downstream too on a next page while there are 6 pages with various readings)


I don't want to waste time reading instruction manuals. It should be simple and easy to use like Windows. If I knew I needed a 6 month course to learn it I would never have bought it.
I didnt think that 6 months are needed to read and understand 18 pages. IMO it's simple and easy to use for anybody with an IQ which has 3 digits but how would you know what readings to expect if you dont read the descriptions or the workshop manual where they explain how O2 readings should look if everything is OK or what's wrong if the readings are out ? :confused
 

·
Registered
Joined
·
1,334 Posts
Discussion Starter #11
It seems that a police scanner and a license plate concealer are more important to be mentioned than the other things which didnt appear then :serious
Then maybe you watched other scanner cos nanocom shows 6 values/page for each position(what you see for upstream is shown for downstream too on a next page while there are 6 pages with various readings)


I didnt think that 6 months are needed to read and understand 18 pages. IMO it's simple and easy to use for anybody with an IQ which has 3 digits but how would you know what readings to expect if you dont read the descriptions or the workshop manual where they explain how O2 readings should look if everything is OK or what's wrong if the readings are out ? :confused

I do not understand the technical data on the screens. A Nanocom is something for an experienced mechanic that can look at these numbers, compare and contrast to diagnose, and knows what should be what. I am nowhere near this level. Since I am not a mechanic I have no foundation for advanced data analysis.


Thank you for your response but I got impatient and purchased 2 new Bosch O2 sensors. I am putting them on right now. If those don't work I will buy 2 more new sensors for the front and install a new MAF.
 

·
Registered
Joined
·
1,334 Posts
Discussion Starter #12
It seems that a police scanner and a license plate concealer are more important to be mentioned than the other things which didnt appear then :serious
Well .. you're the guy who loves electronics right?

You should get one. It's awesome. Check your rear view mirror for piggies.. then press the button. Pass the camera and give it the finger. Once your safe. Press button again. It's funny.

The scanner is awesome. You can easedrop on the police. When you see one behind you .. listen to them run your plates on the road lol. (if they don't have a scanner and just be sure to turn it of if they pull you over). You can also show up near a live scene ... and grab the popcporn. :)

Also if you get front-rear laser jammers... it's the ultimate protection .. in some places you know it's safe to speed. And they are just lazy hiding at the bottom of bridges or behind road signs where the speed limit drops. When the cop shoots his laser gun... the jammers block his gun, allowing you time to slow down. It's 100% legal. Then you flick the jammers off and let him read your speed. It's allot of fun. I laugh my ass off every time. One time ... I forget to turn it off and jammed to gun .. the cop turned around and looked t me then looked at his gun lol. Another time I was going maybe 10 over ... I got shot in the rear (jammers and v1 alerted) jammed his gun driving away laughing my ass off... he was shooting over and over again trying to aquirre my speed .. lol .. if you get lasered in the rear (rare) it's a 100% perfect jam every time. There is nothing they can do.

Same thing with the advanced RD's like V1 and Uniden. The cops radar travels down the road ...or bounces of metal signs and such around curves. It's awesome. I have 100+ saves easy. Zero speeding tickets since 1999. :)

It's a great add on, perfectly legal and lots of fun. :) You should think about it. :)
 

·
Registered
Joined
·
1,334 Posts
Discussion Starter #13
Replaced both rear O2 sensors with Bosch O2 sensors and packed them both with Dielectric grease (also greased the transmission/transfer case temperature sensor with Dielectric grease because the red gear icon keeps coming up on the dash).


Hopefully this works.
 

·
Premium Member
Joined
·
1,412 Posts
Well .. you're the guy who loves electronics right?

You should get one. It's awesome. Check your rear view mirror for piggies.. then press the button. Pass the camera and give it the finger. Once your safe. Press button again. It's funny.
These things are against the law in Europe, they can revoke your driving licene for such things beside a serious fine
 

·
Registered
Joined
·
195 Posts
I have an Ultraguage and a Nanocom. The UG is for the temps. All I know how to do with the Nancom is clear faults.
The Ultragauge can clear engine management faults. If that's the only thing you're using the Nanocom to do you may as well just send it to me!
 

·
Expert Crate Digger
Joined
·
161 Posts
I don't want to waste time reading instruction manuals. It should be simple and easy to use like Windows. If I knew I needed a 6 month course to learn it I would never have bought it.
Sell the Nanocom to me then. :wink

If that's the only thing you're using the Nanocom to do you may as well just send it to me!
I've got dibs on it too! lol
 

·
Registered
Joined
·
1,334 Posts
Discussion Starter #17
The Ultragauge can clear engine management faults. If that's the only thing you're using the Nanocom to do you may as well just send it to me!
Ultra Guage just says press down to suspend alarm ..
 

·
Registered
Joined
·
1,334 Posts
Discussion Starter #18
Ok so in following up and closing this thread (hopefully) I installed 4 new Bosch O2 sensors.

All the problems went away. The over-revving, O2 error codes, running rich, and ... the transmission oil temp light is off. I don't know if it's because I replaced the O2 sensors or sprayed the temp sensor connection at the transfer case with MAF cleaner ...and coated it with dielectric grease.... but all the problems are totally gone! The truck is responsive and NOT running rich anymore. I just got a huge jump in MPG.

I drove around thousands of miles running rich wasting massive amounts of gas .... and who knows what damage I did to the engine constantly blasting it from 2k RPM to 5K RPM .. but I didn't get any codes until recently so I didn't know anything was wrong. So if anyone is reading this and has de-catted (for offroad use only ahem cough cough) you know it could be your O2 sensors causing the rev to rocket and the car to run rich.

So the moral of the story is (I hope) make sure all 4 O2 sensors are Bosch and (preferably) installed at the same time. I was using Bosch in the front and WALKERS in the back. I think this happened over time .. from using WALKERS in the back ..

The Walkers stink .. in my opinion .. when all 4 were Walkers the performance was ok but not the same as before .. .when I removed the Walkers and installed Bosch in the front .. performance improved .. I just got lazy and left the Walkers on the rears because I didn't think the rear O2 sensors were good for anything ... as it turns out (it seems) the rears are very important and have an effect on the performance.

This is all from changing the rear O2 sensors.

The car almost feels like a new car now .. I am not getting 6-9 MPG anymore .. The performance just jumped up to par and so far (knock on wood) all performance issues have been solved.
 

·
Registered
Joined
·
1,334 Posts
Discussion Starter #19

·
Expert Crate Digger
Joined
·
161 Posts
PM sent
 
1 - 20 of 34 Posts
Top