P252A - OBD Trouble Code

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It can be quite stressful to know that there’s an issue with your car. But don’t worry, we are here to explain everything about the OBD-II error P252A. This code is defined as an Engine Oil Quality Sensor Circuit. Basically, there has been an issue detected by the Powertrain Control Module of your vehicle with regards to this Oil quality sensor. This is also the reason why the oil level and oil level temperature display on your instrument cluster isn’t displaying.

The job of the oil quality sensor circuit is to send a signal showing the overall status of the engine oil to the Engine Control Module (ECM). The circuit carefully monitors the quality, temperature as well as the level of engine oil. This is one of the important components and is present on the engine oil pan. This circuit will perform the same function across various car makes and models, however the exact location may vary. Depending on the model of your car the instrument cluster will show different information. In few vehicles the oil temperature, level and pressure may be visible on the gauges. The ECM will set the code if this sensor is not working as needed.

What causes this problem with the Engine Oil Quality Sensor Circuit?

• Issue with the engine oil quality sensor
• Engine oil level is low
• Bad quality oil
• The wiring is having some defects and damages
• Connectors may be loose, or damaged
• Malfunction of the ECM

1. Engine Oil Quality Sensor - Also known as OQS gives real-time information about the quality of the oil in your vehicle. This sensor helps the PCM detects any problems so that the driver can be informed about rectifying the issue. You will have to either repair or replace it as needed.
2. Engine Control Module - Is the central processing unit of your vehicle. It performs the important task of monitoring all the modules of your vehicle and how they’re working. The ECM will inform if any problem needs your attention. You can find the best replacement online at PartsAvatar, order from the comfort of your home and have it reach your doorstep in just a few days.
3. Oil Pressure Gauge - Located on the dashboard of your vehicle, this helps in ensuring the longevity of any vehicle. With you knowing the exact pressure of the oil, you can steer clear of any big issues. The pressure gauge can read wrong if there’s an issue with it, which also can lead to the P252A code being stored. Resolve the error by repairing or replacing it conveniently online at PartsAvatar.
4. Oil Quality Sensor - Is responsible for keeping track of the quality of the oil. The quality sensor helps in understanding any issues that may have come up with regards to the quality of the oil. You can find a replacement for it if you find any problems with it.
5. Powertrain Control Module - Is the brain of your vehicle, which monitors all the other components and how they’re functioning. You can try and repair the issues you were able to find during diagnosis, if that doesn't help remove the P252A code you will have to go for replacement. Find the PCM fitment for your vehicle on PartsAvatar. PCM replacement requires programming by a professional, make sure you have someone reliable for it.
6. Engine Wiring Connector - One of the reasons why the obd-codes in general are set could be due to faulty wiring and connectors. Connectors get damaged over time, and there may be bent pins also. You can try to repair them and see if that helps with the P252A code to go away, otherwise go for replacement. We offer free shipping on orders above $99.
7. Diagnostic Tools - These are the tools that will assist you in diagnosis. There is a range of tools available on PartsAvatar that you can select from, whether it is for buying first time or to replace a tool you already use. You can track your order and receive it in a matter of days.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P252A here:

Common Symptoms

• Difficulty with cranking the engine
• Oil pressure gauge reads low fuel
• Check engine light is illuminated
• Check Oil notification is present on the cars instrument cluster

Here are some ways with the help of which you will be able to correct the OBD Code P252A

• Replace the engine oil quality sensor
• Clean the corrosion from the connectors
• Repair or replace any faulty wiring
• Change the oil and filter is it’s clogged
• Damaged ground straps will have to be readjusted, repaired or replaced
• Flash the ECM or repair it

There is no need to be anxious as Parts Avatar – Car Parts Online is here to help you out! We have high grade Engine Oil Quality Sensor, ECM, Oil Pressure Gauge, Oil Quality Sensor, PCM, Connector, Oil Temperature, Oil Level and a lot more for our precious customers.

Here are some steps which you should follow in order to diagnose this P252A fault code:

• Get hold of your vehicles specific Technical Service Bulletins and see if you can find the code and ways to resolve it there. The TSB will be source of reference through the diagnostic procedure. Make sure you match the TSB’s accurately with your vehicles, year, make, model and engine details.
• Now check the condition of the engine oil and see if it is at the appropriate level or not. You will have to refill it if it’s running low.
• Find the components related to the engine oil quality sensor circuit and inspect if there’s any damages visible. To locate these components, take help from the TSB. Visually inspect the wiring for any damages lie bare wires, burned or chafed surfaces, rubbing, scraping etc. Repair as needed or opt for replacement. Move on to the connectors and see if they’re securely set, or if there’s any corrosion or damage to the pins. Sometimes pins get bent as well. Perform this step with the connectors and wires of the ECM as well.
• In order to verify that everything is configured correctly, refer the TSB. Verify the configurations of the fuse and fusible links as well.
• Using the correct instruments, you can do a voltage check. You will need a DVOM and your TSB again. Ensure the reference voltage is well within the range specified by your vehicle's manufacturer. If you find that there is an absence of power source or ground, then you will need to perform continuity tests to verify the strength of the wiring, connectors and other components. These continuity tests have to be performed after removing power from the circuit and the readings for wiring and connections should show 0 ohms of resistance.
• Resistance of no continuity is indicative of improper wiring, or shorted or corroded wires. These must be repaired and replaced as needed.

Common Mistakes When Diagnosing the P252A Code

• Failed Oil quality sensor
• Defective Powertrain Control Module (PCM)
• Wiring is having some issue