How do you fix a faulty egr valve

Here is a list of possible causes. Some things you have already done.

EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- EGR volume control valve stuck closed
- Faulty EGR Pressure sensor
- Faulty EGR temperature sensor and circuit
- Faulty EGR Valve
- EGR passage clogged
- Exhaust gas leaks
Read more: http://engine-codes.com/p0401_ford.html#ixzz28fATCih2

Sounds like a bad egr valve.

This is not a cut and dry fault code. This means that more than one thing wrong can set the code in the computers memory. Here is the low down on the P0402 fault code. This is from the OBD2 fault code diagnostic book.

P0402 - Exhaust Gas Recirculation Flow Excessive Detected
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
Possible causes - EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- EGR volume control valve stuck closed
- Dead (Weak) battery
- Faulty EGR temperature sensor and circuit
- Faulty EGR Valve
- EGR passage clogged
- Exhaust gas leaks

This problem could be a number of things. Let's start buy checking for light bulbs that are not going out when car is shut off, such as under hood lid, under trunk lid, inside of car that are hard to see, such as lights that usually stay on till you leave car but normally go of after a few seconds. You can tell buy waiting a while, they will be hot to touch. If this is so this is your problem.
Next check alternator, get an ohm meter, start car, set ohm meter to about 20 volts, and with car running put ohm meter cables red to positive of battery and black to negative of battery. This test should let you know if alternator is working and good if reading is between 13- 14.50 volts, if you do your alternator is good,if not alternator is problem.
Next check the battery with ohm meter. With ohm meter set the same way to 20 volts, and car off , put red lead to positive post and black lead to negative post . Your reading should be 12-12.50 volts. If reading is low 9-10 volts then the final test would be a load test. You may have to go to your mechanic, or a battery dealer for this one because not everyone has a load tester. This test will tell you if you need a new battery. They will know right away. Your problem could be a bad battery. All the above tests are for DIY. If you are not able to perform these tests yourself then go to a battery dealer they will do tests for you. GOOD LUCK.

It's usually the pressure sensor. They get contaminated and give faulty readings.

HAVE CAR SCANNED COULD BE FAULTY IDLE SPEED CONTROL.FAULTY EGR VALVE OR BAD FUEL INJECTOR.

The only thing I can think of checking would be the EGR valve, a faulty cat converter or faulty o2 sensor. Converter shouldn't set off check engine light though unless it is clogged causing too much back pressure, most likely EGR Valve.

You may have a gasket leaking oil to the engine cylinders. Once you got it started the oil burned off and the engine will run fine until the next time....
Unfortunately, on this car, it a VERY expensive problem to get fixed.
If the problem occurs again, be careful not to flood the engine. Try to get it running again, and take it in for a professional estimate and repair.

The EGR valve helps your car more efficiently and completely burn fuel by recirculating a portion of your exhaust and running it through the combustion process again. When the EGR valve goes bad, it must be replaced.

The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust back into the intake manifold. This exhaust mixes with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust your EGR valve recirculates also prevents the formation of Nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing emissions testing. Unfortunately, your EGR valve can get stuck, causing NOX gases to build up. You'll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on acceleration.

Here is a picture of where the EGR Valve is located (Accord 1999). Replacing it is fairly simple and straightforward. A vacuum line and a couple of bolts. You'll see what you have to do when you look at it.



If you are replacing the EGR Valve due to the Check Engine Light (MIL) being on with a DTC P0401 then I suggest contacting your Honda Dealer. There was a Product Update Campaign (PUD) in the fall of 1999 that corrected the problem.

Another times, the clean is the solution...I hope help yoiu with this. Good luck, and remember rated this help.

I found your part on Kragen's website and it runs about 100 dollars. The staff in your local store should be able to help guide you in changing it out and may even help you accomplish the task. Pep Boys, Napa Auto Parts, etc. should most likely have the part and the same customer service to help you. Check around though as the prices will most often close to each other can be quite different from time to time.