Error code p2a00 on a nissan frontier 2006....4.0 l

Question

I recently changed catylic converters on my 2006 frontier..error codes p420/30..then I developed a p2a00 code..swapped oxy sensors, error remained ..indicating bad upper oxy on right side...need advice..exhaust leak?? I also recently changed plugs and I removed intake..but error appeared after cat installation....

Answer 1

check for intake or exhaust leaks first after and you will have to perform the mixture ratio self-learning procedure (easy way is disconnect the battery for 30min or so) 

if the code comes back replace the Bank 1 Sensor 1 on the passenger side (air to fuel ratio) sensor and you will have to perform the mixture ratio self-learning procedure (easy way is disconnect the battery for 30min or so)