I'm currently getting codes for bad o2 sensors in the upstream of both banks and came across a youtube video about using Cataclean to "clear the fuel/oxygen system". It's about $30 a bottle and just wondering if I should try that first or just replace those sensors. I'm over 200k mileage wise (03 murano) and I just noticed the past few days of it idling rough and having issues with getting power accelerate when first turning on and sometimes jumping when driving/going in reverse. I don't remember if I've ever replaced the O2 sensors when I've had the car, I know I have replaced the starter and camshaft sensors before though.
Using Cataclean before replacing Oxygen sensors?
160256
1 - 14 of 14 Posts
Joined
·
127 Posts
I'm currently getting codes for bad o2 sensors in the upstream of both banks and came across a youtube video about using Cataclean to "clear the fuel/oxygen system". It's about $30 a bottle and just wondering if I should try that first or just replace those sensors. I'm over 200k mileage wise (03 murano) and I just noticed the past few days of it idling rough and having issues with getting power accelerate when first turning on and sometimes jumping when driving/going in reverse. I don't remember if I've ever replaced the O2 sensors when I've had the car, I know I have replaced the starter and camshaft sensors before though.
Joined
·
3,124 Posts
The codes signify that the ECM is receiving an excessively high voltage from the sensors. If you have a scan tool you should pull up the PIDs for those sensors and see what the voltages are while driving around under various conditions--they should switch high/low frequently. It's suspicious that both failed at the same time, or have you had one code for a single sensor for a while and now are throwing codes for both sensors?
Joined
·
127 Posts
I haven't checked codes for a while but last time it did it was for something else. I posted it on here before but will have to find what it was. I'll check to see if the voltage goes crazy while driving today and report back.
Joined
·
127 Posts
I found my previous post where you replied as well lol https://www.nissanmurano.org/threads/o2-vs-camshaft-vs-crankshaft-sensor.227129/#post-773531 The code was P0420 from 2022. Now the codes are different. I was able to capture the voltage while driving today and they went up and down.
Joined
·
3,124 Posts
Well, the voltages don't seem stuck high although the traces for each bank are quite different when they should be close to each other. What app are you using to do the graphs? If you haven't cleared the codes yet, post the freeze frame data and if your app can access mode $06 (onboard monitors) then there should be failed tests with values for the O2 sensors so post those as well. Also, try graphing those sensors just sitting in P and idling with all accessories turned off after driving around for 20 minutes to get a baseline.
Joined
·
127 Posts
I'm using Car Scanner Pro app. I'll try to post the other stuff today. Thanks
Joined
·
127 Posts
Hi, I hope this is all the information you were talking about. I did the idling graph after 20 minutes of driving as well.
Attachments
Joined
·
3,124 Posts
The DTC for the freeze frame screen you posted says "P04303B"? Is this for a P0430, which I think you stated was thrown in the past?
Unfortunately, the noncontinuous monitors aren't as helpful as the software doesn't translate the values although the hex values associated with the tests do comport with the O2 sensor tests. It looks like the engine is failing misfire tests too. You said the engine is running rough, correct?
The idle traces seem to show the sensor voltages hanging low quite a bit (lean) although I don't like how your software changes the scale based on present values as that makes it more difficult to follow the pattern. Can you set it so that the scale is static from 0-1 volt. I'd suggest also doing a trace during a wide open throttle test. Put the transmission in low gear at a stop and floor it until the tach reads 5k and then let your foot off the gas and coast for a few seconds. But instead of doing sensors at the same time, graph one sensor along with the throttle position percentage.
On a side note, if these are the original O2 sensors then at over 200k miles they're probably ready to replace.
Unfortunately, the noncontinuous monitors aren't as helpful as the software doesn't translate the values although the hex values associated with the tests do comport with the O2 sensor tests. It looks like the engine is failing misfire tests too. You said the engine is running rough, correct?
The idle traces seem to show the sensor voltages hanging low quite a bit (lean) although I don't like how your software changes the scale based on present values as that makes it more difficult to follow the pattern. Can you set it so that the scale is static from 0-1 volt. I'd suggest also doing a trace during a wide open throttle test. Put the transmission in low gear at a stop and floor it until the tach reads 5k and then let your foot off the gas and coast for a few seconds. But instead of doing sensors at the same time, graph one sensor along with the throttle position percentage.
On a side note, if these are the original O2 sensors then at over 200k miles they're probably ready to replace.
Joined
·
127 Posts
I have no clue about the DTC, I just tapped on the freeze frame icon in the app and that's what showed up. I had a P0420 code before, P0430 could have shown up as well if they were related. Was there another place I was suppose to check on those values besides noncontinuous motors? That's the only place I saw where it showed pass/fail tests for the sensors. Yes, my engine is running rough after driving for a bit it will start to sputter and not want to go when I press the gas or shoot off like a rocket when I do.
I'm not sure what you mean about setting the scale, or doing a trace during wide open throttle test. I'm not sure about the last one either but will try to figure it out and post. As for O2 sensors I'm unsure as well. I know I got the car used from a dealership back in 2011 and I don't recall doing the oxygen sensors, at least none show up as purchases with autozone. I did go ahead and purchase 2 and hoping it doesn't cost much to install I may just go ahead and have them replaced and see if the issue persists. Cataclean is about the same price as I paid for the 2 sensors.
Joined
·
127 Posts
Hello, I ended up getting the O2 sensors replaced today and ran the failed/pass test again and the only ones that fail is the $01 $02 Rich to Lean Threshold Voltage. Do you know what that signifies? Also is using Cataclean moot at this point? Thanks
![Image]()
Joined
·
3,124 Posts
Typically, these monitors are measuring how fast or slow the O2 sensor signal switches from rich-lean and lean-rich. Things like vacuum leaks and exhaust leaks can interfere with the O2 sensor signals. Does you scan tool show any pending codes? Cataclean is intended to solve problems related to P0420 and P0430 codes. I'm not convinced it isn't snake oil, but some folks seem to swear by it.
Joined
·
127 Posts
After the sensors were installed I cleared the codes and nothing has popped up. I know I got the p0420 codes over a year ago and they say cataclean helps with improving gas mileage? I may give it a go anyway and see what it does.
Joined
·
127 Posts
Well, after a week of driving around 100 miles from using Cataclean the P0420 code just came on.
1 - 14 of 14 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
