P040A OBD Error Code: Problem & Solutions

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The trouble code P040A can be defined as Exhaust Gas Recirculation Temperature Sensor "A" Circuit.

A lot of unburned fuel was wasted and expelled into the atmosphere by the car engine before the introduction of the exhaust gas recirculation system to the vehicles in the 1970’s. But now the system has changed as vehicle should now have a certain emission rating so that it can proceed with the production.

The emissions are now improved with the use of EGR systems by re circulating the fresh exhaust which is coming from the exhaust manifold or some other parts of the exhaust system and then recycling or re burning it so that the fuel which we pay for with our hard-earned cash is burned effectively.

The main function of the EGR temperature sensor is to provide a means for the engine control module to monitor the temperature which is within the EGR system as well as adjust the flow by using the EGR valve. This is done by utilizing a common temperature sensitive resistor-type sensor.

What causes this problem with the Exhaust Gas Recirculation Temperature Sensor 'A' Circuit?

• Flaws in the connector
• Engine control module might have some issues
• Bad connections
• There can be some defects in the exhaust gas recirculation temperature sensor
• There can be some faults in the wires
• Quirks in the exhaust gas recirculation temperature sensor “A”
• Leakage in the EGR temperature sensor gasket
• Issue of cracked or leaking exhaust pipe in which the sensor is mounted
• The wiring harness or sensor might be burnt
• Exhaust gas recirculation temperature Sensor 'A' harness might be opened or shorted
• There can be bad electrical connection in the exhaust gas recirculation temperature Sensor “A” circuit

1. Fuel Temperature Sensor - Did your mechanic just found out that there is some fault in the Fuel Temperature Sensor? Buy top notch Fuel Temperature Sensor from us at economical prices.
2. EGR Valve Gasket - A faulty EGR Valve Gasket can cause a lot of issues. It would be nice if you get it replaced on time.
3. Powertrain Control Module - Everything is fine with the Fuel Temperature Sensor and still OBD code P040A flashing? Then there is definitely some fault with the Powertrain Control Module. Get it checked and replace if needed.
4. Coolant Temperature Sensor - Coolant Temperature Sensor is an important car part which should never be neglected. May be there is some fault in it due to which P040A code may start flashing.
5. Engine Control Module - A faulty Engine Control Module can be troublesome. You can always rely on us as we have best auto parts for our customers.
6. Ambient Air Temperature Sensor - If everything is alright with PCM, then there is surely some defect in Ambient Air Temperature Sensor. Get it replaced before the situation gets worse.
7. Throttle Position Sensor - P040A code can display due to some faults in the Throttle Position Sensor. So, it is very important to replace the Throttle Position Sensor with us at equitable prices.

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P040A code by mentioning some major symptoms below:

Common Symptoms

• Engine noise might start coming
• Louder exhaust
• There can be a failure in the smog or emissions state
• There can be a lot of exhaust smells
• Engine Light ON can start flashing

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P040A:

• Replace the faulty engine control module
• Make sure to repair the connections
• If there are some flaws in the connector, then you can always repair it
• Leakage in the EGR temperature sensor gasket should be corrected properly
• Replace or repair the exhaust gas recirculation temperature sensor
• You can always repair the flawed wires

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

Basic Step 1

First of all, you must check by visually inspecting the sensor and surrounding EGR system, looking for exhaust leaks in particular

Also check out the sensor and its harness. Remember that high temps can cause havoc on plastic and rubber insulated wires so inspect them thoroughly

Keep in mind that the black soot may indicate an exhaust leak around the area

Basic Step 2

A lot of EGR issues have been caused due to accumulated soot in the exhaust potentially caused by a number of things (poor maintenance, low quality fuel etc.). In this case, it is not an exception, so it can be a good idea to clean your EGR system or at the very least the temperature sensor. Be aware that sensors mounted within the exhaust systems may feel like they are seized when trying to unfasten

Just remember that these sensors are subject to substantial temperature fluctuations, so a bit of heat using an Oxyacetylene torch (not for the layman) may help loosen the sensor

Now once you have removed the sensor use carburetor cleaner or similar product to effectively soak the soot. Use a wire brush to loosen soot in any overly accumulated areas. When you are reinstalling the clean sensor, make sure to apply some anti-seize to the threads to aid in preventing seizing

Basic Step 3

Verify the integrity of the sensor by measuring actual electrical values compared to manufacturer specific desired values. This can be done by using a Multimeter and following manufacturer specific pin-out test procedures