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In this video we have a look at a Nissan Frontier 2.5 that came in with a P2A00 "AFR Sensor Circuit Range/Performance Bank 1 Sensor 1." After a brief look back into the archives of my memory bank I recalled the rear O2 on these Nissan's causing this problem. I wish I had the answer for you as to why but I do not. Perhaps you do? -Enjoy!
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47 thoughts on “Nissan frontier: p2a00 front afr code but actually the rear is bad!?”
  1. Avataaar/Circle Created with python_avatars gloccwrld says:

    I am glad I have found this video my 07 Murano gave me a P2A00 code so I went and replaced to AFR sensor which it needed it was bad but after replacing it keeps giving me the same code this is a second AFR since I thought it was bad. Performance of my Murano seems better after new AFR sensor but code keeps coming up. But base on this video seems like we may have same issue so will check on this.

  2. Avataaar/Circle Created with python_avatars Ricardo Perez says:

    Does this happen to 350z often as well? Where the o2 sensor bank 1 sensor 1 saids it dosent work but it’s actually bank 1 sensor 2?

  3. Avataaar/Circle Created with python_avatars Hector Sanchez says:

    Hey bro I'm struggling with my Nissan frontier 06 with the same code the mechanic replaced the front sensor already and the light comes back again they replaced the sensor again and it won't go away so do you think that the rear sensor is bad too or could be the catalyst converter ?

  4. Avataaar/Circle Created with python_avatars Michael Morris says:

    Thanks for the attitude , always make sure appreciate the reminder .

  5. Avataaar/Circle Created with python_avatars Nicholas von rhine says:

    Nissan said the rear sensor because of its diagnostic function can trigger a code to the front sensor when it malfunctions.

  6. Avataaar/Circle Created with python_avatars John Ridley says:

    Who the heck is watching these videos and is taking the time to comment about trivialities like the name of an anti-seize product? It has no relevance to the entire point of the video. For an encore go complain about the architecture of a building in the background of a news broadcast.

  7. Avataaar/Circle Created with python_avatars Jarvis Jackson says:

    Thank God you just earned a new subscriber all monitors ran I can pass emission

  8. Avataaar/Circle Created with python_avatars Piloto Hernandez says:

    I'm wondering if this is my problem with a 08 Pathfinder v6 code p2a03 sensor 1 bank 2

  9. Avataaar/Circle Created with python_avatars hcoleman 25 says:

    2011 nissan versa has the same problem..I will try replacing the rear o2 sensor

  10. Avataaar/Circle Created with python_avatars Gta V Lovers says:

    Which is the 02 sensor, bank 1 sensor 1, in a 2008 nissan pathfinder?

  11. Avataaar/Circle Created with python_avatars Jefferson Martinez says:

    Nice thanks Erick

  12. Avataaar/Circle Created with python_avatars Maurice motors says:

    I just got a PB 3 from Cornwell on Monday and I already used it on a faulty 12v plug in a freightliner

  13. Avataaar/Circle Created with python_avatars Brian Blakistone says:

    I had this exact issue on a 2009 Murano. Your video helped me determine that it was also a downstream sensor issue. Excellent video, I replaced the sensor and now can get smogged.

  14. Avataaar/Circle Created with python_avatars salceti says:

    Eric,Just had the same DTC on my 2009 Frontier PA200 put my scantool on and turned on live data I am getting activity on A/FR sensor1 and also activity on the HO2S2(B1). HO2S2 Monitor (B1) is lean. Cleared DTC codes Also had a BCM C1724 DTC. I will keep monitoring, could it be just a glitch that threw the code? Joe

  15. Avataaar/Circle Created with python_avatars Jim Bo says:

    That Nissan software module was written by the same Indian H-1Bs that wrote the Boeing 737 MAX MCAS. Luckily, the consequences are not nearly as bad.

  16. Avataaar/Circle Created with python_avatars axidhaus says:

    I just replaced my my front afr sensor a few weeks ago and now I’m getting the P2A00… do you think this might be the problem

  17. Avataaar/Circle Created with python_avatars CaledoniaGarage CaledoniaGarage says:

    thank you!

  18. Avataaar/Circle Created with python_avatars Marlin Young says:

    What autel scan tool is that?

  19. Avataaar/Circle Created with python_avatars rattlecan1987 says:

    I have an 06 altima SE-R with the 3.5 v6 do you think the downstream sensor could be the problem as well since im having the same code. I just changed the upstream but the code came back after 40 miles

  20. Avataaar/Circle Created with python_avatars 3stro says:

    I got the same code in my 09 370z and it has kept coming back even after changing the bank 1 upstream AFR sensor so I guess now I know I should check my rear O2 sensor. It came on after getting an aftermarket clutch installed so maybe the shop didn't connect the sensor all the way correctly when putting everything back together or maybe the sensor is dead. Just got myself an OBD2 sensor with live data capability so I will also check to see if it behaves like the one in this video.

  21. Avataaar/Circle Created with python_avatars Speeder105 says:

    I have a 2005 Nissan 350z. I ran into a similiar issue were I had trouble getting the O2 Sensor and Catalyst Monitors to a ready status. I tried going with the drive cycles a few times and that didn't work. I used the Torque Pro App with a Bluetooth OBDII Wireless Scanner to figure out the culprit of this issue. The car also threw a pending code twice when I performed those driving cycles. It turned out that the Driver Side Rear O2 Sensor was going bad. The way I found out was I looked at the voltage readings for the front and rear O2 Sensors and I noticed that the voltage reading for the driver side rear o2 sensor was stuck at a particular voltage reading regardless of engine load just like in the video with the Nissan Frontier. I ordered a new O2 Sensor and I was able to get all of the monitors to show a ready status.

  22. Avataaar/Circle Created with python_avatars Josh Clark says:

    When a car is in for state inspection do you have to completely reset the monitors and run a drive cycle or do you make sure the monitors just say they are ran. If anyone knows could you let me know please. Thanks so much

  23. Avataaar/Circle Created with python_avatars John says:

    I don't no why either but every nissan i diagnost always lead me to the down stream O2 sensor i would like to no why it points to the up stream Air fuel ratio sensor?

  24. Avataaar/Circle Created with python_avatars Hola! John Rodrigues says:

    Great troubleshooting and memory!

  25. Avataaar/Circle Created with python_avatars Yovany Flores says:

    👉👌👌👌🤜

  26. Avataaar/Circle Created with python_avatars Erik Johnson says:

    SMA has the best detective show going. I can't get enough.

  27. Avataaar/Circle Created with python_avatars Bob DeRocco says:

    Thanks! Enjoyed the way you taught the fix..and proved it!

  28. Avataaar/Circle Created with python_avatars Jetta Red says:

    Awesome! By the way, this seems common on the V6s, as well.

  29. Avataaar/Circle Created with python_avatars J K says:

    Off to buy a rear O2 sensor now. Just replaced the front one because of this code. Light came back on later in the day.

  30. Avataaar/Circle Created with python_avatars Pedro De La Sancha says:

    This is a great video. Thanks for sharing the knowledge, Eric. Not sure if you'll see this anytime soon but I have a 2006 Nissan Pathfinder (4.0L). Check Engine keeps coming on and my Code reader shows the P2A00. Do u know if the issue with this code applies to my Pathfinder as well? Freaking O2 Sensor (B1S2) is $195. 😒😔

  31. Avataaar/Circle Created with python_avatars Neal Feero says:

    GST= generic scan tool. A word of caution when working on nissans. The first thing to check when diagnosing any check engine light. Always check to make sure the ecm has been updated to the latest version. Nissan has a lot of updates for ECMs. A lot of codes are repaired without any parts. Remember always check for factory technicial service bulletins before doing any thing else.

  32. Avataaar/Circle Created with python_avatars Arno Dyck says:

    Nissan has some other strange things as well. For example, even though service information says that the TCM gets engine RPM from the crank sensor, it does not. It comes from the cam sensor. So mid 2000s 3.5 v6 Nissans with a P0340 cam code can act like a bad trans or TCM. Also if a customer keeps driving with a bad wheel speed sensor one of the solenoids in the HCU can remain energized which burns out the transistor in the module.

  33. Avataaar/Circle Created with python_avatars John Bonifas says:

    Erik please tell me about the valve stems thank you or maybe Eric o will tell me

  34. Avataaar/Circle Created with python_avatars armpitdew says:

    i always heard it as Never Seize. Even as a kid

  35. Avataaar/Circle Created with python_avatars Felix Gange says:

    Awesome job 👍🏽👍🏽👍🏽

  36. Avataaar/Circle Created with python_avatars Keith on the GAP says:

    I think it would be nice if, at the start of each video, you and the Missus can do a song and dance? Perhaps the old soft shoe?

  37. Avataaar/Circle Created with python_avatars Justin A says:

    Yes GST = Generic Scan Tool

  38. Avataaar/Circle Created with python_avatars Nosaj 3bors says:

    beetlejuice

  39. Avataaar/Circle Created with python_avatars pyro323 says:

    I'm a huge fan of sony products. Every electronic device I own is a sony. I was, however, looking at the Nikon B700 ($450) for a camera it has 4k image quality and it's made by a company that specializes in optics so you know it's a good product.

  40. Avataaar/Circle Created with python_avatars Eric Chapman says:

    Anyone know why a 94 GMC with a 350 would run rich and sputter ONLY at very low loads and speeds? No codes runs great otherwise and I've replaced all sensors I can think of including fuel pressure regulator. Chevy jokes aside, has been a very reliable truck besides that and I'm stumped.

  41. Avataaar/Circle Created with python_avatars Mr B says:

    Bad coding for fault logic is the reason, indeed it to do with rear response used in checking front but rear fault logic is awol on these, No heater circuit or rear codes when fully disconnected pretty good clue programming logic bit off.
    Most annoying thing is it not in a nissan tsb or fault criteria notes so for sure lot of owners been screwed by a parts canon shop on this one .

  42. Avataaar/Circle Created with python_avatars Shawn Bauman says:

    Eric careful on just reving engine to determine if rear 02 is active on a Nissan. The newer ones will not be come active till you drive it a short bit. AFR 1.5v is accurate for older system. Newer ones are 2.2v. Some newer Nissan's are running 1.78v reading on scan tool when koeo. Again needs to be driven to get it active reving is not enough. Also I am seeing a lot of small leaks causing fuel trim codes. Need to pressurize the exhaust system to find. You will not hear it. Nissan uses rear 02 for fuel trim adjustment they don't tell you this but they do it.

  43. Avataaar/Circle Created with python_avatars Jiff Ry says:

    When I’m removing a stubborn old o2, I snip the wires off and use a regular deep socket

  44. Avataaar/Circle Created with python_avatars protodog1 says:

    Why rear O2 gives front AFR code? My guess is in Japan they read right to left. It's all bassakwards

  45. Avataaar/Circle Created with python_avatars Joe Acfalle says:

    Wow a safety measure to avoid someone from getting carbon monoxide poisoning when the engine drops from steady idle and truck not moving, so said my g-ma.