ok this is not a third gen but my friend is in dier need of help. he has a 99 toyota Rav4 (toyota sucks ) and his check engine light came on. so i came over scanned it and it read EGR insufficient flow detected code p0402. I put a new egr valve on and still light will not go off and still scannes insufficient flow detected. I double checked the egr and it is installed perfect I am stumped I need help and one give me something to look for thanks

 

Did you turn the code off? lol


And use the proper base for the EGR?

 

And any washers that the generics sometimes come with?

Clear the codes. Find a toyota or rav4 board.

 

yes i turned the code off. do you think something else in the egr system is at falt

 

Egr Valve will have a low flow condition if one of the following is an issue.

Most common : VSV Valve which is the vacume solinoid that sends vacume to the EGR. ( Probobal ) Located between the valve cover and the main air chamber on the intake.

Vacume supply to VSV is off, broken or ?

Vacume modulator ( this operates with exhaust pressure to allow the vacume supply to complete its path to the EGR )

Bad EGR Valve. New ? from Toyota ?

And lastly the egr passage is plugged up