Hello forum , I have a prombelm and need some help. My 2005 300c has a check engine light thats driving my up the wall. When checked Im getting a P0198 code, which states that the engine oil temp sensor is giving off a high voltage. The check engine is intermetient at times and stays on at other times. Attemtps to find part called oil temp sensor have been unsucessful, any suggestion.

 

The problem is often the sensor itself and should be checked by the dealer!

 

The problem may be your scanner. I suspect that the car is generating a Chrysler proprietary code that your scanner can't read properly. The car is capable of generating a whole slew of error codes beyond what a run-of-the-mill OBD-II scanner can read. Your scanner may be seeing an error code it doesn't recognize and coming up with the nearest approximation.
The dealer will probably charge you around $85 to hook up to his machine (DRB-III). Generally they will apply that toward the repair bill if you choose to have the car fixed there.
The DRB-III (Diagnostic Readout Box) is capable of reading and dealing with error codes not only from the engine and transmission, but also the climate control, vehicle security system, audio system, etc.

 

Not to step on anyone's toes, this is an LX car, meaning CAN bus. It requires a StarScan, StarMobile or WiTech Chrysler tool or aftermarket CAN bus scanner. All P-codes are standard, not manufacture specific. The code you have is for voltage sense high, meaning that the 5 volt feed to the sensor is open. I doubt the wire is broken. I would guess the sensor is open. Simple to check with a DVOM set to ohms. While your there, verify the 5 volt feed at the sensor and the ground (usually the sensor body) two wire sensor or at the connector (three wire sensor). Use the $85 to put toward a good digital volt ohm meter (DVOM) if you don't already have one. You'll use it more than you think.

 

I think his problem was that he can't find his "engine oil temp sensor". Does the car have an engine oil temp sensor?