oxygen sensor

Kennyray · 04-19-2009, 06:20 AM

My wife has a 99 pathfinder 2wd. CEL is coming on, when I pull the codes it is telling me it is # 2 bank # 2 sensor heating circuit. My question is which side is # 2 bank so I know where to start looking.

mudseeker · 04-19-2009, 06:33 AM

that's going to be your pre-cat sensor assuming there is only one cat on the vehicle.

Kennyray · 04-19-2009, 07:12 AM

there are 2 cats on the truck and 4 sensors, from what I understand sensor 2 is post cat

mudseeker · 04-19-2009, 07:55 AM

ok, then it would be on the same side of the engine as cylinders 2, 4 and 6 and post cat. Why would a nissan have 2 cats? the dang things have an exhaust pipe the size of a straw and they have two cats!?

Kennyray · 04-19-2009, 02:11 PM

Its a V-6 with 2 pipes into the muffler. The cats are about 4 inches from the manifolds. real easy truck to put on true duals.

jessie_london · 04-19-2009, 03:15 PM

I priced them out on a 1998 and it was like 1400 just for the cats themselves. just thought i would let ya know. I just cleared the code and it never poped back on.

Kennyray · 04-19-2009, 10:01 PM

rock auto has the cats for 187.00 each. but thats not the problem. mud, can you tell me the testing procedure for the heated oxygen sensors, I don't want to throw parts at it and hope its fixed, thanks

mudseeker · 04-20-2009, 04:24 AM

i just did this on my truck. for mine i connected a test lamp to pin D of the harness side and a good ground, it should light up with the ignition on. next i connected the test light at pins C and D, if there is power there, then you have a wireing problem, otherwise, replace the sensor.

might want to have autozone print out something so you know what pins are what for your truck

Kennyray · 04-20-2009, 05:18 AM

Thanks, Ill let ya know how it goes

Kennyray · 06-12-2009, 06:36 PM

Replaced the Oxygen sensor yesterday and so far so good, put some miles on the thing and the code has not come back.

04-19-2009, 06:20 AM	#1
Kennyray Senior Member Join Date: Oct 2005 Location: Birmingham, AL Posts: 648	oxygen sensor My wife has a 99 pathfinder 2wd. CEL is coming on, when I pull the codes it is telling me it is # 2 bank # 2 sensor heating circuit. My question is which side is # 2 bank so I know where to start looking. __________________ On a quiet night you can hear a Ford rust

04-19-2009, 06:33 AM	#2
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,373	that's going to be your pre-cat sensor assuming there is only one cat on the vehicle. __________________ i'd rather be hunting

04-19-2009, 07:12 AM	#3
Kennyray Senior Member Join Date: Oct 2005 Location: Birmingham, AL Posts: 648	there are 2 cats on the truck and 4 sensors, from what I understand sensor 2 is post cat __________________ On a quiet night you can hear a Ford rust

04-19-2009, 07:55 AM	#4
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,373	ok, then it would be on the same side of the engine as cylinders 2, 4 and 6 and post cat. Why would a nissan have 2 cats? the dang things have an exhaust pipe the size of a straw and they have two cats!? __________________ i'd rather be hunting

04-19-2009, 02:11 PM	#5
Kennyray Senior Member Join Date: Oct 2005 Location: Birmingham, AL Posts: 648	Its a V-6 with 2 pipes into the muffler. The cats are about 4 inches from the manifolds. real easy truck to put on true duals. __________________ On a quiet night you can hear a Ford rust

04-19-2009, 03:15 PM	#6
jessie_london Junior Member Join Date: Jan 2009 Posts: 6	I priced them out on a 1998 and it was like 1400 just for the cats themselves. just thought i would let ya know. I just cleared the code and it never poped back on.

04-19-2009, 10:01 PM	#7
Kennyray Senior Member Join Date: Oct 2005 Location: Birmingham, AL Posts: 648	rock auto has the cats for 187.00 each. but thats not the problem. mud, can you tell me the testing procedure for the heated oxygen sensors, I don't want to throw parts at it and hope its fixed, thanks __________________ On a quiet night you can hear a Ford rust

04-20-2009, 04:24 AM	#8
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,373	i just did this on my truck. for mine i connected a test lamp to pin D of the harness side and a good ground, it should light up with the ignition on. next i connected the test light at pins C and D, if there is power there, then you have a wireing problem, otherwise, replace the sensor. might want to have autozone print out something so you know what pins are what for your truck __________________ i'd rather be hunting

04-20-2009, 05:18 AM	#9
Kennyray Senior Member Join Date: Oct 2005 Location: Birmingham, AL Posts: 648	Thanks, Ill let ya know how it goes __________________ On a quiet night you can hear a Ford rust

06-12-2009, 06:36 PM	#10
Kennyray Senior Member Join Date: Oct 2005 Location: Birmingham, AL Posts: 648	Replaced the Oxygen sensor yesterday and so far so good, put some miles on the thing and the code has not come back. __________________ On a quiet night you can hear a Ford rust

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