SOURCE: How to replace EGR valve on 2000 camry V6?
If you have a P0401 code from a CEL, the first thing is to check the EGR vacuum modulator. It is a little well usually next to the EGR. Pop the cap off and dust the little sponge inside. Sometimes this gets stuffed up with carbon particles and causes recirculation problems. You should clean the tubes hooked to it while you are there. Reset the code and see if the light comes back.
Replacing the EGR is not a tidy job. It is an expensive part to replace and you will disconnect the three hoses and dismantle it from engine by two nuts. Save it for the later if the previous trick fails to work.
SOURCE: p0401 code
P0401 indicates that EGR Flow Insufficient.
But if you have handled it and believe it is okay, I will give you tips on turning the warning off.
Or remove the battery terminal head for 10 minutes.
SOURCE: 2000 toyota camry code p0401 change egr valve
First did you reset the computer after replacing the EGR valve if you don't the computer doe'nt reconize the new sensor so it doe'nt reset the peremiters.Then check all passages and lines in the intake manifold there could be a clogg somewhere.Go to www.rockauto.com and you'll find EGR pressure sensor for under $30.00.
SOURCE: I have a 2001 Toyota
Okay, the first test would be to start engine and put vacuum to egr valve so it opens the engine should drop in idle and may stall out, this test will tell you that the valve works and passages are clear but if the engine doesnt drop in idle then you may have a bad valve or block passage, if this is an electric egr then this is hard to test some of these without a scan tool, what you can check is the passage by removing the valve and then starting the engine and it will rev up and then use finger there will be two passages, one for exhaust that you will here and the other if you put finger over should be vacuum if you have both then i would look at valve. the valve contains the postion sensor as part of the valve,if it vacuum lets go back after the first test above you will now need to test the selinoid, this is computer controlled and allows vac to open the valve, these go bad often and is mostly a common problem, you will need to remove vac line that goes to valve, the other line should have vac with engine running.check it to make sure it does. if not check lines. next you will need a test light, remove the connector to solenoid and test for power and ground. you will have one of the two, the computer will send power or ground to open, you need to find out which is lacking, next is to start engine and apply power or ground whatever its lacking and vacuum should come out of the port to egr hose you removed, if no vac then the soleniod is the problem, make sure when checking connector you unplug it and test then plug in and applie what is no there. good day.
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
P0401
Insufficient EGR Flow
What does that mean?
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 EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.
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Symptoms
You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.
Causes
A code P0401 most likely means one or more of the following has happened:
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
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