unbolt the head pipe then the manifold.
Intake manifold gasket may be leaking - check for loose bolts or replace fasket.
oxygen sensor is found either in exhaust manifold or in actual exhaust pipe between manifold and muffler
below exhaust manifold... left hand side... were the manifold joins into 1 pipe becoming the exhaust
the turbo is on the end of the exhaust manifold before the exhaust pipe starts .
with your back to the engine its on ur left side under the exhaust manifold
Just downstream after the exhaust manifold
Leak or blown gasket.
should you drain oil in the car if the head gasket is blow
Are some of these questions for real ? (a fair question for novice) or are site owners after free consultancy level & cost answers to further shareholders maximum yield ?check with oem supplier
Most oxygen sensors are located on the exhaust manifold or just after the manifold on the exhaust pipe(s). Your truck probably has two oxygen sensors, one on each side.
depending what engine code you have...either on the catalytic converter , or on the exhaust manifold itself
On the 2.5L it is located on the exhaust manifold directly under the intake manifold on the drivers side, you can locate it by tracing the electrical connection to the ehaust manifold as there is only one connection, the 02 sensor.