Had it checked out by a tech and it also said BANK 1 # 1 along with P0134 error. Was advised it is the oxygen sensor. Went online to buy a new one but am not sure what to buy! There are sensors before the catalytic converter and others after the catalytic converter and some others that are posted as whole units. As you can guess, the price range is $30 -$267. I am confused what to get. Any recommendations on what I need and the best place to purchase it?