P0195
UniversalEngine Oil Temperature Sensor Malfunction. This code indicates that the powertrain control module (PCM) has detected an irrational signal from the Engine Oil Temperature (EOT) sensor circuit, meaning the sensor's reading is outside the expected operating range or is not correlating correctly with other temperature sensors.
Medium SeverityThe P0195 code signifies a malfunction in the Engine Oil Temperature (EOT) sensor circuit, which provides critical information to the engine's computer about the oil's heat. A faulty sensor can lead to incorrect fuel mixture adjustments and potentially cause damage to engine components if the oil temperature is not accurately monitored.
⚠️ Before You Begin (Safety First)
Always disconnect the battery before working on electrical components to prevent accidental shorts or injury. Allow the engine to cool completely before handling hot oil or engine components. Wear appropriate personal protective equipment, such as gloves and eye protection.
Common Symptoms
- Check Engine Light illuminated
- Engine may run rough
- Reduced fuel economy
- Engine overheating (if the reading is falsely low)
- Engine performance issues (stalling, misfires, poor acceleration)
- Incorrect oil temperature gauge readings (if equipped)
Common Causes
- Faulty Engine Oil Temperature (EOT) sensor
- Damaged or corroded wiring in the EOT sensor circuit
- Poor electrical connection at the sensor or PCM
- Short circuit or open circuit in the EOT sensor wiring
- Malfunctioning Powertrain Control Module (PCM) (rare)
Frequently reported on: General/Universal
Diagnostic Steps
- Safely park the vehicle on a level surface and allow the engine to cool completely. Disconnect the negative battery terminal.
- Locate the Engine Oil Temperature (EOT) sensor. Its location varies by vehicle but is typically screwed into the engine block or oil pan.
- Inspect the EOT sensor's wiring and connector for any signs of damage, corrosion, or loose connections. Repair as necessary.
- If the wiring appears good, use a multimeter to test the resistance of the EOT sensor. Compare readings to vehicle-specific specifications. Readings should change with temperature.
- If the sensor tests faulty or shows inconsistent readings, carefully remove the old sensor (you may lose some oil, so have a drain pan ready) and install a new OEM-equivalent sensor.
- Reconnect the electrical connector, top off engine oil if necessary, reconnect the battery, and clear the P0195 code using an OBD-II scanner. Test drive the vehicle.
👨🔧 When to Call a Professional
It is advised to consult a professional mechanic if you are unsure about testing electrical circuits, accessing the sensor, or if the code persists after replacing the EOT sensor, as there may be a deeper wiring or PCM issue.
Commonly Asked Questions
What is an Engine Oil Temperature Sensor?
The Engine Oil Temperature (EOT) sensor measures the temperature of the engine oil and sends this data to the Powertrain Control Module (PCM). This information is crucial for fuel mixture, ignition timing, and sometimes engine cooling fan operation.
Can I drive with a P0195 code?
While you might be able to drive, it's not recommended. An inaccurate oil temperature reading can lead to improper engine operation, reduced fuel efficiency, and potentially cause long-term damage to engine components if left unaddressed.
How do I test the EOT sensor?
You can test the EOT sensor using a multimeter to check its resistance across its terminals. The resistance should change predictably as the sensor's temperature changes. Compare your readings to the specific service manual values for your vehicle.
Is replacing the EOT sensor difficult?
Replacing the EOT sensor is generally considered a medium difficulty DIY task. The main challenges are locating the sensor, accessing it, and potentially dealing with a small amount of oil leakage during removal and installation.
What if replacing the EOT sensor doesn't fix the code?
If the code persists after replacing the sensor, the issue might be with the wiring harness (open or short circuit), the electrical connector, or, in rare cases, the Powertrain Control Module (PCM) itself. Further diagnostic steps involving circuit testing would be required.