O2 issues

maizenblue · 03-30-2015, 05:53 PM

Alright, so I have a 2010 Z 65k miles. Back in january the fuel pump died. At the time it was already throwing codes p2a00 and p2a03 for both upstream sensors. I figured the pump was the issue and replaced it but the light never went away.
Fast forward to february when my fender liner falls off and my car sucks up water. I live in the north so salt is everywhere. Salt coats the filters and maf sensors. I just replaced the filters and maf sensors on Thursday, as well as a clogged up pcv valve and spark plugs while I was at it.
now, the car is throwing codes or both downstream o2 sensors. All I can think of is that the salt killed them but why is it just now popping up? Im not sure if I should just replace all four sensors or what?

maizenblue · 03-30-2015, 05:53 PM

http://i.imgur.com/zLGEUwf.png

brancky3 · 03-30-2015, 06:10 PM

You have high flow cats right? Those are sensor 2 codes, meaning post cat. I wouldn't worry about them, they have zero effect on how your car runs.

maizenblue · 03-30-2015, 06:21 PM

I have been running fast intentions hfc for quite a while with no secondary o2 codes until now. And it is not the cat inefficiency code.

brancky3 · 03-30-2015, 06:23 PM

How old is the "historic" fault?

maizenblue · 03-30-2015, 06:40 PM

Since December but it has been ongoing

Jordo! · 03-30-2015, 06:48 PM

The sensor 1 code is the more serious -- that sensor might need to be replaced.

The bank 2 codes are most likely due to the HFC's, and shouldn't adversely affect anything. Replacing the sensors may or may not make a difference in getting the CEL.

maizenblue · 03-30-2015, 06:57 PM

Im hesitant in saying the downstream codes are from the hfc. The code is saying low voltage and slow response. Not catalyst inefficiency.

brancky3 · 03-30-2015, 07:09 PM

Quote:

Originally Posted by maizenblue

Im hesitant in saying the downstream codes are from the hfc. The code is saying low voltage and slow response. Not catalyst inefficiency.

I have seen codes thrown for the same thing when using nonfoulers / O2 extensions, it's not always inefficiency.

maizenblue · 03-30-2015, 07:17 PM

I appreciate the input.
as far as the upstreams go, both of them have been throwing codes in the past although only one is being shown as historic. Its just confusing to me that all 4 are throwing codes

gomer_110 · 03-30-2015, 08:45 PM

First, the p2a00 and p2a03 are codes a number of use have had on here with little to no reason. I believe some have found intake piping leaks and that remedied their problem. In my case I checked the AFR while the car was running and didn't see any problems that would justify the code. In the end I just turned the p2a00 and p2a03 codes off through uprev.

Now onto your other codes. I had the exact same codes except on the primary o2 sensors last summer after an autox oops broke both my primary o2 sensors. For o2 sensors to work they need power and atleast on our cars there's a fuse in the power circuit. In my case the fuse was blown as a result of the broken o2 sensors. I'd check the service manual (should be able to find a link to it on here) and locate the fuse and make sure it's still good. More likely than not it's in the fuse box buried next to the battery meaning you'll have to pull the battery to get to it.

Also if you do end up replacing the primary o2 sensors make sure you get the right ones. I believe it was mid 2010 that they changed the connector resulting in a different part number. I know when I got mine almost nobody showed that there were two different sensors depending on build date.

maizenblue · 03-30-2015, 09:01 PM

Just checked the fuse box and the fuse is not blown.
thanks for the info about the o2 sensor. I thought it wasnt until 2011 that it changed. Ill be sure to order the correct sensor if I go that route

maizenblue · 03-31-2015, 04:07 PM

http://i.imgur.com/p3StBEG.jpg
I logged the O2 readings today. They are constant at .28 volts. Unless anyone can chime in and say otherwise, to me that means they have gone bad?

maizenblue · 04-02-2015, 12:08 PM

So I replaced the downstream oxygen sensors. One of them were completely plugged with steel wool from last summer when I was running test pipes. I assume that was causing the codes for the downstream sensor

Jordo! · 04-02-2015, 02:39 PM

Quote:

Originally Posted by maizenblue

So I replaced the downstream oxygen sensors. One of them were completely plugged with steel wool from last summer when I was running test pipes. I assume that was causing the codes for the downstream sensor

Hmm. So before the steel wool broke off and clogged the O2 did it keep the CEL off?

I wonder if some sort of filter screen might work better.

Glad you resolved the problems

03-30-2015, 05:53 PM	#1 (permalink)
maizenblue Enthusiast Member Join Date: Sep 2013 Location: Denver Posts: 288 Drives: 2010 370Z Rep Power: 11	O2 issues Alright, so I have a 2010 Z 65k miles. Back in january the fuel pump died. At the time it was already throwing codes p2a00 and p2a03 for both upstream sensors. I figured the pump was the issue and replaced it but the light never went away. Fast forward to february when my fender liner falls off and my car sucks up water. I live in the north so salt is everywhere. Salt coats the filters and maf sensors. I just replaced the filters and maf sensors on Thursday, as well as a clogged up pcv valve and spark plugs while I was at it. now, the car is throwing codes or both downstream o2 sensors. All I can think of is that the salt killed them but why is it just now popping up? Im not sure if I should just replace all four sensors or what?

03-30-2015, 06:10 PM	#3 (permalink)
brancky3 Track Member Join Date: Jun 2014 Location: Greer, SC Age: 36 Posts: 754 Drives: 14 370Z Gun Metallic Rep Power: 15	You have high flow cats right? Those are sensor 2 codes, meaning post cat. I wouldn't worry about them, they have zero effect on how your car runs. __________________ 2014 Nissan 370z Gun Metallic 6-spd Test Pipes \| Nismo CBE \| Stillen Gen3 \| Swift springs \| Advanation Sway Bars \| RJM Clutch \| GTR DBA Premium Wheels

03-30-2015, 06:23 PM	#5 (permalink)
brancky3 Track Member Join Date: Jun 2014 Location: Greer, SC Age: 36 Posts: 754 Drives: 14 370Z Gun Metallic Rep Power: 15	How old is the "historic" fault? __________________ 2014 Nissan 370z Gun Metallic 6-spd Test Pipes \| Nismo CBE \| Stillen Gen3 \| Swift springs \| Advanation Sway Bars \| RJM Clutch \| GTR DBA Premium Wheels

03-30-2015, 06:48 PM	#7 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	The sensor 1 code is the more serious -- that sensor might need to be replaced. The bank 2 codes are most likely due to the HFC's, and shouldn't adversely affect anything. Replacing the sensors may or may not make a difference in getting the CEL. __________________ Enjoy it. Destroy it.

03-30-2015, 08:45 PM	#11 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36940	First, the p2a00 and p2a03 are codes a number of use have had on here with little to no reason. I believe some have found intake piping leaks and that remedied their problem. In my case I checked the AFR while the car was running and didn't see any problems that would justify the code. In the end I just turned the p2a00 and p2a03 codes off through uprev. Now onto your other codes. I had the exact same codes except on the primary o2 sensors last summer after an autox oops broke both my primary o2 sensors. For o2 sensors to work they need power and atleast on our cars there's a fuse in the power circuit. In my case the fuse was blown as a result of the broken o2 sensors. I'd check the service manual (should be able to find a link to it on here) and locate the fuse and make sure it's still good. More likely than not it's in the fuse box buried next to the battery meaning you'll have to pull the battery to get to it. Also if you do end up replacing the primary o2 sensors make sure you get the right ones. I believe it was mid 2010 that they changed the connector resulting in a different part number. I know when I got mine almost nobody showed that there were two different sensors depending on build date. Jordo! likes this. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

03-30-2015, 05:53 PM	#2 (permalink)
maizenblue Enthusiast Member Join Date: Sep 2013 Location: Denver Posts: 288 Drives: 2010 370Z Rep Power: 11	http://i.imgur.com/zLGEUwf.png

03-30-2015, 06:21 PM	#4 (permalink)
maizenblue Enthusiast Member Join Date: Sep 2013 Location: Denver Posts: 288 Drives: 2010 370Z Rep Power: 11	I have been running fast intentions hfc for quite a while with no secondary o2 codes until now. And it is not the cat inefficiency code.

03-30-2015, 06:40 PM	#6 (permalink)
maizenblue Enthusiast Member Join Date: Sep 2013 Location: Denver Posts: 288 Drives: 2010 370Z Rep Power: 11	Since December but it has been ongoing

03-30-2015, 06:57 PM	#8 (permalink)
maizenblue Enthusiast Member Join Date: Sep 2013 Location: Denver Posts: 288 Drives: 2010 370Z Rep Power: 11	Im hesitant in saying the downstream codes are from the hfc. The code is saying low voltage and slow response. Not catalyst inefficiency.

03-30-2015, 07:17 PM	#10 (permalink)
maizenblue Enthusiast Member Join Date: Sep 2013 Location: Denver Posts: 288 Drives: 2010 370Z Rep Power: 11	I appreciate the input. as far as the upstreams go, both of them have been throwing codes in the past although only one is being shown as historic. Its just confusing to me that all 4 are throwing codes

03-30-2015, 09:01 PM	#12 (permalink)
maizenblue Enthusiast Member Join Date: Sep 2013 Location: Denver Posts: 288 Drives: 2010 370Z Rep Power: 11	Just checked the fuse box and the fuse is not blown. thanks for the info about the o2 sensor. I thought it wasnt until 2011 that it changed. Ill be sure to order the correct sensor if I go that route

03-31-2015, 04:07 PM	#13 (permalink)
maizenblue Enthusiast Member Join Date: Sep 2013 Location: Denver Posts: 288 Drives: 2010 370Z Rep Power: 11	http://i.imgur.com/p3StBEG.jpg I logged the O2 readings today. They are constant at .28 volts. Unless anyone can chime in and say otherwise, to me that means they have gone bad?

04-02-2015, 12:08 PM	#14 (permalink)
maizenblue Enthusiast Member Join Date: Sep 2013 Location: Denver Posts: 288 Drives: 2010 370Z Rep Power: 11	So I replaced the downstream oxygen sensors. One of them were completely plugged with steel wool from last summer when I was running test pipes. I assume that was causing the codes for the downstream sensor

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