Skip the auto shop - Our mechanics make house calls

P0199 OBD-II Trouble Code: Engine Oil Temperature Sensor Circuit Faulty

Check Engine Light

P0199 code definition

P0199 is indicating a fault in the engine oil temperature sensor circuit. This code is similar to P0195, P0196, P0197, P0198.

What the P0199 code means

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.

What causes the P0199 code?

  • Faulty oil temperature sensor
  • Open or short in wiring harness
  • Electrical connection that is faulty or loose

What are the symptoms of the P0199 code?

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.

How does a mechanic diagnose the P0199 code?

  • 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.

Common mistakes when diagnosing the P0199 code

Not following steps in the proper order or skipping steps is the most common mistake made when diagnosing this code.

How serious is the P0199 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.

What repairs can fix the P0199 code?

Additional comments for consideration regarding the P0199 code

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.

Need help with a P0199 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...


Related questions

Q: RPM surge when using turn signal

I would not delay repairing the fuel leak. With that long host of symptoms, I would enlist the help a qualified mechanic, such as one from YourMechanic, to come out and diagnose all the issues. The code stored for the...

Q: The airbag light is on, could it be caused by previous work done on the car?

The SRS (Airbag) light comes on when the controller has sensed a malfunction somewhere in the system. The malfunction may be an open circuit or an incorrect voltage at any of the sensors. When the controller sees the error, it...

Q: Check engine light

Hello there, thanks for writing in. A failing coolant temperature sensor can have some subtle symptoms on your 2004 Toyota Camry. The coolant temperature sensor sends the signal to the coolant temp gauge, if the gauge reads wrong than the...