I have been getting a "Service Engine Light Soon" on my 98 BurB 5.7, I stopped by AutoZone today and had them put the code reader on it and they came up with the reading that a "Second Bank Oxygen Sensor was bad". Now this vehicle has two 2d bank sensors (after the cat) and two 1st bank sensors (before the cat). They want to sell me four sensors as they suggest I replace all of them, before the others start to go bad.
With the 2d bank sensors costing $69.99 each and the first bank sensors costing $89.99 each for a total of $340.76 incl/tax, and the salesman working on salery plus commission, I wonder why they want me to replace all four?
I am not sure if I want to replace any of them, what do you guys suggest?