Hey guys. My CEL came on in the avalon (I know, I know, this is a solara forum, but hey the engine is the same) while driving yesterday, so I took it to autozone to get the OBDII ran (which they do for free, by the way!!).
The code was P0401 - EGR Flow Insufficient
The guy at autozone says that the EGR valve is likely clogged from carbon buildup. The replacement part is a whopping 169.99. He said though, that I could take it off and clean it myself with some carb cleaner, and that might fix it. I was wondering how hard this is, and if anyone had any other opinions on what to do.
If your going to replace one part that might fix the problem temporarily but it will come back an haunt you!
If replacing replace everything and have the ports cleaned.
Parts: EGR $160
EGR gaskets $2.50
Modulator for EGR $60ish
Don't wast time cleaning the carbon build up on the EGR cause it won't clear up! That residue is STUCK on the walls of the EGR.
If you realy
want to do everything you can before replacing the EGR system then do the following in this order...
-Disconect your negative battery terminal
hoses for clogs/leaks. clean them out with intake cleaner and let dry.
-Take out the EGR and use intake cleaner and a strong toothbrush and clean out the inside. Use a flat head screwdriver to open up the EGR valve and continue spraying while opening and closing the valve and let dry.
-Take the Modulator and open it. There should be a white cotton looking filter in there. Use compressed air to clean it out. Flip it upside down from the way you took it out and close it back up.
-Spray throttle body intake cleaner into the EGR pipe that connects to the engine block. Finish off by spraying all into the throttle body and move the butterfly back and forth while you do so.
-Reassemble everything including the negative terminal. (Wait 30 minutes)
-You will have slight hesitation to start the car from all of the intake cleaner and will notice white smoke out of the tailpipe. (It's ok)
-After 20-50 miles if the light does not come back on your good to go. Stop by Autozone and have them clear the stored code if they have not done so already.
-Keep in mind that this will come back again as the EGR system will need replacement eventualy.
-If all that don't do the trick then take it to Toyota and they will 99.9% say that the entire system will need replacement. It's very unlikly that it is sensor, pcm, or circuit malfunction.
If you need assistance please feel free to drop by my house.