Number of drive cycles for CEL reset?
#1
Number of drive cycles for CEL reset?
The car in question is an ’02 XKR.
Does anybody know the number of drive cycles needed for a P0400 code reset? About a week ago my CEL lit up with three codes: P0400 (EGR flow), P0171 and P0174 (Bank A and B lean running). I took apart the throttle/EGR valve assembly and found that one of the EGR valve mounting screws was missing and the other one was loose. The only thing that held the valve on the intake elbow must have been the carbon build up and the “sticktion” of the gasket. Just to ensure that I do the job once I cleaned the valve, removed and cleaned the EGR pipe and replaced all of the gaskets.
After reassembly the rough idle that I was experiencing when the fault code set is no longer present. So I believe I have fixed the problem. I drove the car to work and back (about 45 km round trip, suburban-type driving), it appeared to run fine. I was expecting the CEL to reset itself after two trips, but this morning it is still there. I checked the codes and they are still present and cannot be erased with my cheapie code reader (mainly because I have an inactive C1175 wheel sensor fault lurking in the memory).
After how many cycles does the CEL reset itself?
Does anybody know the number of drive cycles needed for a P0400 code reset? About a week ago my CEL lit up with three codes: P0400 (EGR flow), P0171 and P0174 (Bank A and B lean running). I took apart the throttle/EGR valve assembly and found that one of the EGR valve mounting screws was missing and the other one was loose. The only thing that held the valve on the intake elbow must have been the carbon build up and the “sticktion” of the gasket. Just to ensure that I do the job once I cleaned the valve, removed and cleaned the EGR pipe and replaced all of the gaskets.
After reassembly the rough idle that I was experiencing when the fault code set is no longer present. So I believe I have fixed the problem. I drove the car to work and back (about 45 km round trip, suburban-type driving), it appeared to run fine. I was expecting the CEL to reset itself after two trips, but this morning it is still there. I checked the codes and they are still present and cannot be erased with my cheapie code reader (mainly because I have an inactive C1175 wheel sensor fault lurking in the memory).
After how many cycles does the CEL reset itself?
#3
#4
Unable to erase stored codes
My code reader is unable to erase the stored faults. It comes up with "Erase Fail". I believe the problem is that in addition for the three P-codes I have a C1175 code stored in memory that my reader tries to reset at the same time. That's why I'm trying to figure out the drive cycles needed for the CEL to reset itself.
I guess there is a possibility of the EGR valve itself being faulty, but that would be too much of a coincidence..
I guess there is a possibility of the EGR valve itself being faulty, but that would be too much of a coincidence..
#5
My code reader is unable to erase the stored faults. It comes up with "Erase Fail". I believe the problem is that in addition for the three P-codes I have a C1175 code stored in memory that my reader tries to reset at the same time. That's why I'm trying to figure out the drive cycles needed for the CEL to reset itself.
I guess there is a possibility of the EGR valve itself being faulty, but that would be too much of a coincidence..
I guess there is a possibility of the EGR valve itself being faulty, but that would be too much of a coincidence..
As long as that code is stored, the CEL will stay illuminated.
Graham
#6
My code reader is unable to erase the stored faults. It comes up with "Erase Fail". I believe the problem is that in addition for the three P-codes I have a C1175 code stored in memory that my reader tries to reset at the same time. That's why I'm trying to figure out the drive cycles needed for the CEL to reset itself.
I guess there is a possibility of the EGR valve itself being faulty, but that would be too much of a coincidence..
I guess there is a possibility of the EGR valve itself being faulty, but that would be too much of a coincidence..
As long as that code is stored, the CEL will stay illuminated.
Graham
#7
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#8
It can sometimes just be an out-of-range signal from one of the sensors to the ECM so it may not come back.
Graham
#9
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