Tag Archives: What P0195 Trouble Code Mean?

DTC P0195 Engine Oil Temperature Sensor ‘A’ Circuit

In the intricate realm of automotive diagnostics, diagnostic trouble codes (DTCs) serve as essential tools, uncovering potential issues within a vehicle’s systems. DTC P0195 assumes significance as an indicator of problems pertaining to the Engine Oil Temperature Sensor ‘A’ circuit. This comprehensive article delves into the causes, symptoms, inspection procedures, and effective solutions for diagnosing and resolving DTC P0195.

1. Causes of DTC P0195:

DTC P0195 occurs when the Engine Control Module (ECM) detects irregularities or out-of-range values in the Engine Oil Temperature Sensor ‘A’ circuit. The underlying causes can include:

– Faulty Engine Oil Temperature Sensor ‘A’: A malfunctioning sensor can produce inaccurate temperature readings or send no signal at all.

– Wiring and connector issues: Damaged or corroded wiring and connectors within the sensor circuit can disrupt the signal transmission.

– Open circuit: A break in the sensor circuit can lead to a lack of signal transmission.

– Faulty ECM: An ECM malfunction can cause erroneous readings from the sensor.

2. Symptoms of DTC P0195:

Recognizing the symptoms associated with DTC P0195 assists mechanics in accurate diagnosis:

– Illuminated Check Engine Light (CEL): DTC P0195 triggers the CEL to alert the driver of a potential problem.

– Erratic engine performance: Inaccurate engine oil temperature readings can impact engine performance and efficiency.

3. Inspection of DTC P0195:

Meticulous inspection techniques are essential for precise diagnosis:

– OBD-II scan: Utilize an OBD-II scanner to retrieve the DTC and freeze frame data, providing insight into the conditions triggering the code.

– Visual examination: Inspect the Engine Oil Temperature Sensor ‘A’ wiring and connectors for visible damage or corrosion.

– Wiring integrity check: Inspect for open circuits or damaged wiring within the sensor circuit.

4. Resolving Causes of DTC P0195:

Addressing DTC P0195 involves specific steps tailored to the underlying issue:

– Engine Oil Temperature Sensor ‘A’ replacement: Replace a malfunctioning sensor with a new, high-quality unit that adheres to manufacturer specifications.

– Wiring and connector repair: Repair or replace damaged wiring and connectors to ensure accurate signal transmission.

– Circuit continuity test: Verify continuity within the sensor circuit to identify any open circuits.

– ECM diagnosis: If an ECM malfunction is suspected, diagnose and address the issue through reprogramming or replacement.

5. Clearing DTC P0195:

After successfully addressing the root cause, clear the DTC from the ECM’s memory using an OBD-II scanner. This step confirms the issue’s resolution and prevents the recurrence of the CEL.


DTC P0195, indicating problems in the Engine Oil Temperature Sensor ‘A’ circuit, underscores the importance of accurate sensor readings for optimal engine performance. By comprehending its causes, recognizing its symptoms, employing meticulous inspection techniques, and implementing effective solutions, mechanics can accurately diagnose and rectify this issue. Ensuring reliable sensor performance remains essential for achieving optimal engine functionality, fuel efficiency, and overall vehicle operation.