Question about Ford Taurus
Hi, P0402 indicates the flow sensor is seeing excessige EGR flow. There can be a few reasons for this.
1. The hoses to the sensor are clogged or leaking
2. The EGR valve has failed open or not closing properly/jammed
3. The sensor has failed
Unless you want to buy all new parts (new valve is $50, new sensor is another $50), the above items must be checked out to determine what if any parts are needed for the repair. The parts involved are shown in the picture below. I recommend you remove the hoses to the sensor and check them for blockage and/or leaks. Also remove the egr valve and look into the port to see if it is closed. If not closed or dirty, clean out the valve with carburetor cleaner and see if it will close by default. If not, replace the valve.
If the hoses and valve are OK, I would test the sensor. You would need an voltmeter to run the test below. Please let me know if you have any questions, and thanks for using FixYa.
Posted on Mar 26, 2011
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Posted on Jan 02, 2017
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EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor (DPF). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0402 code means that OBD detected an excessive amount of EGR.
You may notice drivability problems such as the engine may surge off idle. There may also be other symptoms.
A code P0402 most likely means one or more of the following has happened:
With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor.
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