P0195 Code Meaning and Next Steps

First checks take 10 minutes for basic checks. No special tools are usually needed for the first checks.

Can you keep driving?

Stop driving if any of these apply

!There is overheating, steam, or a visible coolant leak.
!The temperature gauge moves toward hot or the engine starts running much worse than normal.

If the light is steady and the vehicle still drives normally: Often yes for a short time, but it should not be ignored if drivability changes are obvious.

What to check first

Step-by-step checks

1
Safety first
Let the engine cool before inspecting the sensor, connector, or any hot oil-area components
2
Free - no tools
Check whether the oil warning lamp, temperature gauge, or limp-mode behavior lines up with the code
3
Basic tool needed
Inspect the sensor connector and harness for oil contamination, heat damage, or a loose fit near the engine block or filter housing
4
Basic tool needed
Look for recent oil-filter, sensor, or engine-bay work that may have disturbed the circuit
5
Basic tool needed
If scan data is available, compare the reported oil temperature with the cold engine state before ordering parts
6
Basic tool needed
Do not treat this as a pressure issue unless there are separate oil-pressure symptoms too

If the code returns

-If the reading is implausible cold or hot, the sensor circuit is more suspect than the oil itself.
-If the connector is oil-soaked or damaged, fix that before replacing the sensor body.
-If the code returns after the harness is moved, wiring or terminal fit becomes the stronger suspect.

Background

What this code means

P0195 is a generic OBD-II code for an engine oil temperature sensor circuit malfunction.

Unlike the fuel-rail codes above, this one belongs to the oil-temperature sensor family. The ECU is unhappy with the sensor circuit itself, not necessarily the oil level or oil pressure.

Diagnosis

Common causes

Most common

Failed oil temperature sensor

The sensor may no longer report a believable oil temperature.

Common

Connector or wiring damage

Heat, oil, or vibration can interrupt the circuit near the engine.

Common

Contaminated connector

Oil intrusion or corrosion can distort the signal and trigger the code.

Possible

Harness routing issue

A harness that sits too close to heat or moving parts can fail intermittently.

Avoid these mistakes

What not to do

xDo not confuse this with an oil pressure fault unless the vehicle also has pressure-related symptoms.
xDo not inspect hot engine components without letting them cool first.

Parts

Parts that may need replacing

PartTypical costNotes

Engine oil temperature sensor$20-$90Most relevant when the circuit is intact but the reading is not believable.

Connector or wiring repair$20-$160Often the actual fix when the signal is contaminated or intermittent.

Oil leak or sealing repairVariesUseful when oil contamination at the connector is part of the problem.

Related OBD codes

P0196

P0196 means the engine oil temperature sensor is reading outside the expected range.

P0197

P0197 means the engine oil temperature sensor is reading too low.

P0198

P0198 means the engine oil temperature sensor is reading too high.

Source notes

Generic OBD-II (SAE J1979 / ISO 15031-5). P0195 was seeded from dtcdb and then expanded around engine oil temperature sensor circuit faults, connector contamination, and harness heat damage.

This guide is written as a generic multi-make reference, so bulletin history, sensor locations, and repair order can still change by manufacturer and engine family.

This is generic OBD-II guidance and should not override vehicle-specific service information. Exact diagnosis and repair steps vary by make, engine family, and model year.

Last reviewed: 2026-04-10

Reference: Open reference

P0195 - The Engine Oil Temperature Sensor Circuit Is Not Working Properly