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P0199 is a diagnostic trouble code (DTC) for "Engine Oil Temperature Sensor Circuit Faulty". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
P0199 is indicating a fault in the engine oil temperature sensor circuit. This code is similar to P0195, P0196, P0197, P0198.
P0199 is found when the ECM has detected an intermittent fault in the engine oil temperature sensor. The ECM expects to see a voltage signal coming from the oil temperature sensor. When the signal is intermittently out-of-range, P0199 is set.
This condition causes a failsafe mode to be triggered and a diagnostic trouble code (DTC) set to prevent damage to the vehicle. Failsafe mode will remain in effect until the fault is resolved or normal sensor operation is detected.
The most common symptom is the ECM after the fault is detected will set a failsafe mode and cause the Check Engine Light to be illuminated on the dash. No drivability issues are normally associated with P0199.
A technician will begin by installing an OBD-II scan tool into the vehicle's DLC port. They will then check for any code present and the freeze frame data associated with each code.
Next, the technician will perform a road test. Under the road test the technician will do their best to drive under the same conditions as the code was set under.
Once the code reappears, a visual inspection of the wiring and sensor itself will be performed to look for anything damaged, broken, or abnormal.
If there is nothing found during the visual inspection, a test will be performed on the engine oil temperature sensor using the scan tool. This scan tool will monitor changes in voltage and readings over time and will allow the technician to recognize any underlying issues.
Not following steps in the proper order or skipping steps is the most common mistake made when diagnosing this code.
The most serious side effect of P0199 is the oil temperature sensor not working. The temperature sensor is needed to prevent engine damage in case of the vehicle overheating and is a critical component in normal vehicle operation. The only symptom that is noticed in most cases is the Check Engine Light illuminated on the dashboard.
P0199 is a generic code that is commonly seen - especially on higher mileage or older vehicles.
With P0199 being an intermittent issue, it can be difficult to track down at times. An advanced level scan tool is required to diagnose this code. These advanced scanners are able to track and graph changes in sensor data that are especially useful in circumstances where intermittent issues are present.
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