1998 Rav4 Problem Code P0401 ( EGR insufficient flow )

These are usually the egr control vacuum solenoid. Typically intermittent and test good.

Don

The world is not small enough to make this a likelyhood.

How did you determine that these two parts are new?

Anyhoo, as chance would have it, I replied to the George Ganann post with helpful diagnostic tests and an explanation of the not-so-accurate

Click here to see:

Hello Guys, When the code P0401 came up, I decided to give it a tune up, cleaned the throttle body the whole nine. When I checked out the EGR, it appeared to have been very recently removed. I noticed the base of the EGR was cleaned up and the bolts that hold the pipe to the base are new. The EGR modulator valve looked new and thru a mirror the red bolt that holds the VSV and the VSV also looks to have been replaced (all tested fine). They look new! !! So I went to the Toyota dealer to get a NEW EGR modulator valve and a VSV. In there parking lot I changed the modulator valve and cleared the DTC from the computer. The ride home (half hour ride) the DTC P0401 never came on. I noticed a little oil from the bottom hose of the modulator. The hose that goes to the base of the EGR. Is oil normal? Do you think it's possible that a bad PCV valve was fouling the modulator valve?

PS Thanks a lot Don and Comboverfish for your help, looks new and is new, well, another lesson I try to remember! Thanks!! Rob

Comboverfish wrote:

PS Thanks a lot Don and Comboverfish for your help

D>>Hello, Anyone know George Ganann ? Or does anyone know what was the problem

The hose at the bottom of the modulator (when looked at in it's installed position) is the large backpressure hose off of the exaust port on the EGR valve. There is no reason for this to accumulate oil internally. External oil could come from a valve cover gasket leak.

You're welcome,

Toyota MDT in MO