While the vehicle is running have someone put their foot over the tail pipe exhaust as you listen up front the noise will get louder and easier to pin point the source.
Unbolt from the block & take the nuts off studs to exhaust flange. You will need a new gasket for the block & a new one for the flange.
follow your exhaust from your exhaust manifold and you will find.
either in exhaust manifold or in exhaust between manifold and muffler
its screwed into your exhaust manifold.
you have 3 of them ,1in each exhaust manifold and 1 in one of the pipe leaving the exhaust manifold.
If it was removed then YES.
its screwed into the exhaust manifold,undo wire and unscrew at manifold.
it will be on the exhaust manifold towards the back by the fire wall or just below the doenut gasket. it will be the first 02 sensor in the exhaust system going from engine to the tail pipe. good luck NEUTZ
Its probably around $500 mostly because of the amount of labor that it takes to replace it. However if you just order the gasket from the auto parts store and replace it yourself it'll only cost you $20.
19 lbs on the studs, and 30 on the nuts.
first its an egr valve and its between the exhaust manifold and the exhaust pipe itself usually on the passenger side
The throttle body base gasket would be located between the throttle body and the intake manifold.