In the exhaust header pipes before the catalytic converters.
Most vehicle has 1 o2 sensor but some do have 2.most o2 sensors are located near the manifold or near the beginning of the exhaust pipe.
SOURCE: P0340 code in my Jeep Liberty 2002
Since a P0340 Could be either the Cam Position Sensor or The Crank Position Sensor they are obviously in 2 different spots, however they both either sit on the back of the engine or on the transmission bellhousing. Your Cam Sensor is at the top and your Crank Sensor is near the bottom.
Hope this gives you some direction. Thanks for using FixYa!
Sincerely,
JC
SOURCE: 2002 Jeep Liberty P0174 code and mech has changed the o2 sensor
Can't tell you exactly what is wrong but the one thing you said is of concern...Map sensor should not be full of oil. If it is, I'd want to know why. In finding the reason for that, you may also find the reason why you are having a problem.
Jeep uses two kinds of engine crank venting. you either have a pcv valve or an orifice controlled system. If either are obstructed it can overpressure the crankcase and cause all kinds of problems.
Years of experience tells me this isn't something I can guess at and be 100% sure I have the right answer but based on what you said, I'd look there first!
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