Which O2 sensor is it.
12-17-2005, 12:37 PM
#1
Senior Member
Thread Starter
Join Date: Jun 2004
Posts: 244
Which O2 sensor is it.
I have a cali spec and i know i have 4 of them in the front.
I just pulled a P0420 code of the car and I am tryin to determine which one does this code deal with.
Also, would this qualify as a DIY job right on the street or would i need a shop for this?
Any help is greatly appreciated.
I just pulled a P0420 code of the car and I am tryin to determine which one does this code deal with.
Also, would this qualify as a DIY job right on the street or would i need a shop for this?
Any help is greatly appreciated.
12-17-2005, 02:31 PM
#2
Alldatadiy - p0420 tw catalyst sys-b1
On Board Diagnosis Logic
The ECM monitors the switching frequency ratio of front and rear heated oxygen sensors.
A warm-up three way catalyst with high oxygen storage capacity will indicate a low switching frequency of rear heated oxygen sensor. As oxygen storage capacity decreases, the rear heated oxygen sensor switching frequency will increase.
When the frequency ratio of front and rear heated oxygen sensors approaches a specified limit value, the warm-up three way catalyst malfunction is diagnosed.
Malfunction is detected when warm-up three way catalyst does not operate properly, warm-up three way catalyst does not have enough oxygen storage capacity.
Possible Cause
Warm-up three way catalyst
Exhaust tube
Intake air leaks
Injectors
Injector leaks
Spark plug
Improper ignition timing-most of these would be followed with other codes.......
WITH GST
Start engine and drive vehicle at a speed of more than 70 KPH (43 MPH) for 2 consecutive minutes .
Stop vehicle with engine running.
Set voltmeters probes between ECM terminals 63 (front heated oxygen sensor right bank signal), 62 (front heated oxygen sensor left bank signal) and engine ground, and ECM terminals 72 (rear heated oxygen sensor right bank signal), 71 (rear heated oxygen sensor left bank signal) and engine ground.
Keep engine speed at 2,000 rpm constant under no load.
((((I beleive you can do these tests right at the 02 instead of ecm--anyone else have any input on this??))))))
Make sure that the voltage switching frequency (high & low) between ECM terminals 72 and engine ground, or 71 and engine ground is very less than that of ECM terminals 63 and engine ground, or 62 and engine ground. Switching frequency ratio = A/B A: Rear heated oxygen sensor voltage switching frequency B: Front heated oxygen sensor voltage switching frequency This ratio should be less than 0.75 . If the ratio is greater than above, it means warm-up three way catalyst does not operate properly. Go to "Diagnostic Procedure". NOTE: If the voltage at terminal 62 or 63 does not switch periodically more than 5 times within 10 seconds at step 5, perform trouble diagnosis for "DTC P0133, P0153" first.
"""When the frequency ratio of front and rear heated oxygen sensors approaches a specified limit value, the warm-up three way catalyst malfunction is diagnosed."""
Basically - The front and rear 02 signals on bank 1 are to different and beyond specs.
On Board Diagnosis Logic
The ECM monitors the switching frequency ratio of front and rear heated oxygen sensors.
A warm-up three way catalyst with high oxygen storage capacity will indicate a low switching frequency of rear heated oxygen sensor. As oxygen storage capacity decreases, the rear heated oxygen sensor switching frequency will increase.
When the frequency ratio of front and rear heated oxygen sensors approaches a specified limit value, the warm-up three way catalyst malfunction is diagnosed.
Malfunction is detected when warm-up three way catalyst does not operate properly, warm-up three way catalyst does not have enough oxygen storage capacity.
Possible Cause
Warm-up three way catalyst
Exhaust tube
Intake air leaks
Injectors
Injector leaks
Spark plug
Improper ignition timing-most of these would be followed with other codes.......
WITH GST
Start engine and drive vehicle at a speed of more than 70 KPH (43 MPH) for 2 consecutive minutes .
Stop vehicle with engine running.
Set voltmeters probes between ECM terminals 63 (front heated oxygen sensor right bank signal), 62 (front heated oxygen sensor left bank signal) and engine ground, and ECM terminals 72 (rear heated oxygen sensor right bank signal), 71 (rear heated oxygen sensor left bank signal) and engine ground.
Keep engine speed at 2,000 rpm constant under no load.
((((I beleive you can do these tests right at the 02 instead of ecm--anyone else have any input on this??))))))
Make sure that the voltage switching frequency (high & low) between ECM terminals 72 and engine ground, or 71 and engine ground is very less than that of ECM terminals 63 and engine ground, or 62 and engine ground. Switching frequency ratio = A/B A: Rear heated oxygen sensor voltage switching frequency B: Front heated oxygen sensor voltage switching frequency This ratio should be less than 0.75 . If the ratio is greater than above, it means warm-up three way catalyst does not operate properly. Go to "Diagnostic Procedure". NOTE: If the voltage at terminal 62 or 63 does not switch periodically more than 5 times within 10 seconds at step 5, perform trouble diagnosis for "DTC P0133, P0153" first.
"""When the frequency ratio of front and rear heated oxygen sensors approaches a specified limit value, the warm-up three way catalyst malfunction is diagnosed."""
Basically - The front and rear 02 signals on bank 1 are to different and beyond specs.
12-17-2005, 09:22 PM
#4
Supporting Maxima.org Member
Join Date: Oct 2000
Posts: 450
It is the O2 sensor that has a white wire. Bank 2 sensor 1 I believe.
Your problem is not the 02 sensor, theres a TSB for this problem that can be resolved under the 8yr/80k warranty because many times the problem is for the fnt precat. If you are over the wattanty period and can't afford a new precat get an 02 simulator.
Your problem is not the 02 sensor, theres a TSB for this problem that can be resolved under the 8yr/80k warranty because many times the problem is for the fnt precat. If you are over the wattanty period and can't afford a new precat get an 02 simulator.
12-17-2005, 10:00 PM
#5
p0420---tw catalyst sys-b1
Bank 1 (The side of the engine with the #1 cylinder.) wouldn't it be?? Maybe I'm wrong...The way I understand that crap is--the pre cat and post cat sensor are to much in variation thus setting the mil light, so It could be either.---Like I said I'm new and am maybe reading it wrong..So listen to whtmax.
Bank 1 (The side of the engine with the #1 cylinder.) wouldn't it be?? Maybe I'm wrong...The way I understand that crap is--the pre cat and post cat sensor are to much in variation thus setting the mil light, so It could be either.---Like I said I'm new and am maybe reading it wrong..So listen to whtmax.
12-18-2005, 07:56 AM
#6
Senior Member
Thread Starter
Join Date: Jun 2004
Posts: 244
Originally Posted by Whtmax'01
It is the O2 sensor that has a white wire. Bank 2 sensor 1 I believe.
Your problem is not the 02 sensor, theres a TSB for this problem that can be resolved under the 8yr/80k warranty because many times the problem is for the fnt precat. If you are over the wattanty period and can't afford a new precat get an 02 simulator.
Your problem is not the 02 sensor, theres a TSB for this problem that can be resolved under the 8yr/80k warranty because many times the problem is for the fnt precat. If you are over the wattanty period and can't afford a new precat get an 02 simulator.
I got 85K so i'm over that warranty. And i just spent 400 on new coils and plugs. So i cant really afford to re-do all the parts in my car.
12-18-2005, 08:08 AM
#7
those arent all o2 sensors up front. the far right is not an o2 sensor. the 3 to the left are and the other is on the cylinder bank closest to the windshield. one primary is upfront along with 2 secondaries and the other primary is in the location i mentioned above. you need to check the faq for the tsb and see the information from nissan. you can either go that route with the reprogramming or some have been successful with using an o2 simulator.
12-20-2005, 09:23 PM
#8
Senior Member
Thread Starter
Join Date: Jun 2004
Posts: 244
Originally Posted by sloppymax
those arent all o2 sensors up front. the far right is not an o2 sensor. the 3 to the left are and the other is on the cylinder bank closest to the windshield. one primary is upfront along with 2 secondaries and the other primary is in the location i mentioned above. you need to check the faq for the tsb and see the information from nissan. you can either go that route with the reprogramming or some have been successful with using an o2 simulator.
12-21-2005, 08:51 AM
#9
Newbie - Just Registered
Join Date: Dec 2004
Posts: 6
cars at the stealer now for 0420
I got a nice surprise on the way to
work yesterday. I had the OBDII scanner
in my glove box, and it was P0420.
I have 77k so I took a chance it was under
8/80k. Later on last night I heard the good news.
They tech said I need a new Pipe,
and associated hardware 5 parts in all- sorry he was not very specific.
I am guessing it was the redesigned front piece.
I will take a look later today. Suprisingly I think the dealer
likes charging these jobs to Nissan North America, b/c
I haven't had any probs yet. getting things fixed. But I also
always dangle other jobs in front of them, then turn them down.
Eg. Front pads & rotors $395. Ya right! Anyhow the diagnostic would
have been $65, if I was out of warranty i would prob. opt for one of
those Oxygen sens. simulators.
work yesterday. I had the OBDII scanner
in my glove box, and it was P0420.
I have 77k so I took a chance it was under
8/80k. Later on last night I heard the good news.
They tech said I need a new Pipe,
and associated hardware 5 parts in all- sorry he was not very specific.
I am guessing it was the redesigned front piece.
I will take a look later today. Suprisingly I think the dealer
likes charging these jobs to Nissan North America, b/c
I haven't had any probs yet. getting things fixed. But I also
always dangle other jobs in front of them, then turn them down.
Eg. Front pads & rotors $395. Ya right! Anyhow the diagnostic would
have been $65, if I was out of warranty i would prob. opt for one of
those Oxygen sens. simulators.
12-21-2005, 09:28 PM
#10
Originally Posted by MY2000MAX
So its not an O2 sensor problem? I am totally confused with this.
This TSB has diagrams of all the O2 sensor locations if you wanna try to replace em yourself:
http://maxima.theowensfamily.com/tsb/NTB02-051a.pdf
If replacing the O2s don't help, then you'll probably have to get a new pre-cat or an O2 simulator to get rid of the code.
12-22-2005, 08:30 AM
#12
Originally Posted by RHMax
I'm going to change all 4 sensors on my 2K. I don't want to chase and see which is bad, but I'm going to wait until after the New Year.
12-22-2005, 02:08 PM
#14
Newbie just Registered
Join Date: May 2005
Location: LA/OC, CA
Posts: 2,795
Originally Posted by Puppetmaster
Cool.... did ya get the new ones from Dave B or someone else?
Originally Posted by 2001SE
Thats stupid
12-27-2005, 03:01 AM
#16
I see your in new york..I would assume if you are anything like near Chicago where I bought the car you can find a back door shop to help you out.....stop in at a few of the "cheap" shops. A shop with a tech 2, mastertech, consult II, or lab scope can tell you which 02 sensor it is... When I bought my car I had a mastertech put on it and looked at all the data before I bought it. The shop also put it on a lift for me and we checked the under side....All at the cost of $40.00---This time of year if you call and act like you know what you're talking about, (mastertech, tech2, etc) they will probably put this tool on for $20.00 just for your potential return business- Another thing you could do is call your local automotive training center (college etc) and ask them if they will do it for you, they usually charge around $15.00 an hour and it takes less than 20 minutes to do............................
..Or you could buy one of these
http://cgi.ebay.com/ebaymotors/ProSc...99085167QQrdZ1
or
http://cgi.ebay.com/ebaymotors/Windo...98118886QQrdZ1
I did alot of research on these and almost got a gb going for the one. They are decent, only problem is the pcm only gives output data every 100 milliseconds or faster depending on the vehicle. (if the mil light is illuminating, you should see why on the tool)
IMO I wouldn't call the dealership, they will look at the same info on the scan tool as any other shop and would probably charge you a full hour. (locally in Iowa it's $85-$95 depending on which dealer.) 02 sensors are a mandated generic spec on all ODB II systems so ANY aftermarket scan tool must legally show 02 readings, as long as the tool has the scope capabilities.
..Or you could buy one of these
http://cgi.ebay.com/ebaymotors/ProSc...99085167QQrdZ1
or
http://cgi.ebay.com/ebaymotors/Windo...98118886QQrdZ1
I did alot of research on these and almost got a gb going for the one. They are decent, only problem is the pcm only gives output data every 100 milliseconds or faster depending on the vehicle. (if the mil light is illuminating, you should see why on the tool)
IMO I wouldn't call the dealership, they will look at the same info on the scan tool as any other shop and would probably charge you a full hour. (locally in Iowa it's $85-$95 depending on which dealer.) 02 sensors are a mandated generic spec on all ODB II systems so ANY aftermarket scan tool must legally show 02 readings, as long as the tool has the scope capabilities.
12-27-2005, 09:06 AM
#17
Senior Member
Join Date: Aug 2001
Posts: 244
I have the same P0420 code error. I was told it was due to me getting my aftermarket exhaust. The wierd this is that the CEL didnt show up until like a yr after i got my exhaust. IS there a way with the ConsultII to bypass that
o2 sensor completely, so that I wont get the CEL.????
Sorry didnt mean to hijack this thread. But any input would be very helpful
o2 sensor completely, so that I wont get the CEL.????
Sorry didnt mean to hijack this thread. But any input would be very helpful
12-27-2005, 10:36 AM
#18
Newbie - Just Registered
Join Date: Dec 2005
Posts: 1
P0138 Sensor Problem
I'm new to this web site so excuse me if I am not making sense. I had my fuel system flushed at Valvoline a few months ago and they REALLY messed up my car. My SES light kept coming on and I took it back 4 times before they agreed to have the problem looked at by Nissan. I took it to the dealership where they replaced the throttle body ($910.00) and Valvoline paid for it. I've been driving the car for 1 month now and the light came on again. It gave a code of P0138--02 Sensor (high volts) Bank 1 Sensor 2. Was this caused by Valvoline also or is this a problem that a lot of 02 Maxima's have? Which sensor is this and can I replace it myself (I don't trust the dealership)?
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