1 mechanic says my knock sensor's bad & needs to be replaced. Other says O2 sensor. Can one affect the other?

-This is for a '98 Subaru Outback.Here are the symptoms for both Knock Sensor and Oxygen Sensor as well as links below for information on how to test them:



Knock Sensor - Symptoms

Bad Gas Mileage

Hesitation / Jerking

Shaking / Vibrating

Check Engine Light

Noises From Engine

Detonation / Misfiring

Strong Exhaust Smells



Oxygen Sensor Symptoms

Rough Idle

Poor Fuel Economy

Increased Emissions

Engine Missing or Pinging
take it to the dealer ask them to give you a quote or estimate and then leave the place they will give you a diagnostic and you will just pay around 55 but dont authorize anything you will have to pay a million dollar to fix a car in a dealer just pay for the diagnosis