My engine check light came on and I took it to the shop and they told me i had bad o2 sensor. Currently i have 112,*** miles on my car. I repalce the Y pipe and the cat. converter and the exhaust with stillen b pipe and exhaust. My question is how many o2 sensors do i need and where can i get them from other then the dealer, since they're so expensive!!

Some Help Please

 

AutoZone had the best price I found: $77.99 per sensor, and they're the BOSCH OEM ones. There are 2 O2 sensors near the engine (front and rear manifolds) but the sensors are different model numbers. They're the same price though at AutoZone, and both BOSCH. By the way, the BANK 1 sensor is the REAR manifold, BANK 2 is the FRONT manifold sensor. My Nissan dealer used the Bank 1/Bank 2 lingo when mine went bad...Good luck!
-Chad