P252B Fault Code

Engine Oil Quality Sensor Circuit Range/Performance

• What does that mean?
• Symptoms
• Causes
• Solutions

The P252B fault code indicates an issue with the Engine Oil Quality Sensor Circuit's range or performance. This sensor is responsible for monitoring the quality of the engine oil, providing critical information to maintain engine health and efficiency. When the sensor detects oil that does not meet certain quality standards, it triggers this fault code, alerting the driver to potential problems.

What are the symptoms of the P252B code?

Symptoms associated with this fault code may include:

• Engine oil quality warning light illuminated on the dashboard.
• Decreased engine performance, such as reduced fuel efficiency or power.
• Unusual engine noises, which can indicate poor lubrication.
• Possible engine overheating if oil quality severely deteriorates.

What causes the P252B code?

Several factors can lead to the P252B fault code being triggered, including:

• Faulty engine oil quality sensor that is unable to provide accurate readings.
• Worn or degraded engine oil that does not meet specifications.
• Electrical issues such as frayed wiring, poor connections, or corrosion that can disrupt the signal from the sensor.
• Software glitches in the engine control module (ECM) that misinterpret sensor data.

How to fix P252B?

To resolve the P252B fault code, the following steps are recommended:

• Inspect and replace the engine oil if it is old or contaminated.
• Check the engine oil quality sensor for proper functioning and replace if defective.
• Examine the wiring and connectors associated with the sensor for damage, repair any issues found.
• Clear the fault code using an OBD-II scanner and perform a test drive to see if the issue reoccurs. If the code returns, further investigation may be needed to assess the ECM.