Engine light on
a cloud of smoke
the egr flow sensor is internal to the egr valve very common problem egr valve needs to be replaced
It needs a new EGR valve.
p0401 is related to EGR valve flow. Possible bad EGR, check passageway under EGR to see if its plugged See also for the DPFE before changing the EGR Valve.
No
Check engine light on
Code P1491 Means: EGR Valve Lift Insufficient Detected EGR Valve needs to be replaced
Overheating and high boost pressure typically are signs of an EGR problem.
it usually means the the EGR valve needs to be replaced. If your car is "bucking" on start up then for sure it is the EGR valve.
The EGR valve is located at the front of the h22a4 engine. The EGR valve is right beside of the front of the EGR valve.
it will lose power
You can't really clean the EGR valve. If it's faulty, it simply needs to be replaced. -Jesse