Had the previous owner installed an egr blank plate?
My first thought was the previous owner disconnected the vacuum lines to either stop the fault or some folks tried disconnecting the vacuum lines shut the EGR down.
Is it possible that you partially fixed it but the EGR valve is the culprit since you renewed all the other stuff? Maybe still sticking open? Sometimes it pays to do one thing at a time to pinpoint the cause, such as swap out the EGR valve?
I wonder if a techstream analysis could shed some light?
On reading mrmoose again it seems that one of the sensors is telling the EGR valve to open causing the fault. EGR is also turned on and off by the intake air temp sensor on the air cleaner.
martynvella wrote:Have a look at what sensors are involved in the system and try to borrow a set from a working vehicle and swap out one at a time. In my industry it is a faulty sensor giving misleading information more often than not.
Gipsy wrote:MrMoose, did you have a look at that Bailey's pdf? Google p0400 hilux and click the Bailey's link.
DeadlyBeast wrote:Hi Moose good post
I wonder if the missing vacuum regulating valve filter may possibly cause the fault alone or if the valve itself has been damaged as a result of ?km without filtration
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