P2A00 Code on a 2009 FX35 at 115K miles right after oil change

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doowopinfiniti

Member
Car
2009 FX 35
I just got finished changing the oil at 115k miles and as I was driving to AutoZone, I noticed that the "Service Engine Soon" light came on. I carry an OBD-II reader in my car and so I scanned the code and got back P2A00. I performed a quick search on my phone and found that it's
P2A00 INFINITI - Air Fuel Ratio Sensor Circuit Range/Performance Bank 1 Sensor 1
P2A00 INFINITI Air Fuel Ratio Sensor Circuit Range/Performance Bank 1 Sensor 1
https://www.autocodes.com/p2a00_infiniti.html
Last week my car threw code P0451 which is a simple fix of tightening your gas cap. Could this be related to today's code of P2A00???

I removed and tightened the gas cap a couple times, cleared the code and I hope the code doesn't come back. I searched and I didn't find a single FX35 with this problem. There were, however, many other Infiniti's (G35/G37's) that had this issue.

What do you guys think?
 
Any mods done to your car? P2A00 is your o2 sensor thats on the left exhaust manifold, not the cat. With HFCs I got the AFR bank 1/2 Sensor 2 code I believe was P0420/P0430. Have you seen worse gas mileage/ exhaust smell? That sensor probably needs to be replaced.


Sent from my iPhone
 
No mods at all. The service engine light hasn't come back at all either. Since filling her up that day, gas mileage has been normal as usual. I've only driven about 60-70 miles though.
 
Update: I took it to my mechanic and he found a leak on the exhaust near the sensor, so he suggested I take it to a muffler shop and have them fix it.
At the muffler shop, they said this is common on the g35's and this is the first fx35 they have seen with this issue. They ended up finding both sides cracked near the cats where the bracket bolts on and so they welded the cracks and it cost me $50.
Now I'll drive the car and hope the code doesnt come back.

Sent from my HTC6525LVW
 
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