It should have four. I attached two pics below. The first is a pic of the exhaust system. I highlighted four places to check.
If they are there, then look at pic 2. It identifies the sensors positioning. I placed a B1 and B2 on the page. That stands for bank 1 and bank 2.
Now, there are two sensors for each bank. They are identified as
HO2 11 and HO2 12 and HO2 21 and HO2 22. The first number identifies the bank (engine side), and the second number is which sensor, the first or second from the engine.
To determine which one needs to be replaced, you need to know if it is bank 1 or 2 (handwritten) and then if it is sensor 1 or 2. For example, bank 1 sensor 1 would be the one I circled in blue.
I hope this helps. Let me know if you have other questions.
See pics below.
Images (Click to enlarge)
Saturday, October 16th, 2021 AT 6:30 PM