I have been trying to trouble shoot an error code that kicked in after I had 100-cell cats and 4-new oxygen sensors installed on the car. I just got the Durametric software package for reading codes which is great, but I am having trouble interperting the data. I get one code which is:
"P1275 Factory Default Code 16 Signal delay time for oxygen sensor aging bank 1"
When I scrolled through to look for relevent data for trouble-shooting, this is what I came up with:
Oxygen sensor voltage ahead/behind of cat converter bank 2 0.45/0.45
Oxygen sensor voltage ahead/behind of cat converter bank 1 0.45/0.45
Sensor signal period ahead of cat converter bank1/bank2 1.70 / 0.57
Mean amplitude behind cat converter bank1/bank2 0.160 / 0.125
Regulator delay behind cat converter bank1/bank2 1.27 / -0.03
Oxygen sensor resistance ahead/behind bank 1/ bank 2 0/0 0/0
Cat converter monitoring time bank1/bank 2 1/1 sec
Oxygen sensor bank 1/bank2 1.0%/1.0%
Oxygen sensor heat ahead/behind bank1/bank2 4.28/4.28 4.28/4.28
A little background: the 100-cell cats I had installed were used, but in good working order when removed from the original car.
We have double checked the connections to the oxygen sensors, they seem to be fine.
We replaced a cat on one side with a new unit still getting error code.
We have tried raising and lowering the oxygen sensors in the exhaust stream.
We moved the precat bung onto the header (previously was further downstream)
The shop that is doing most of the work setup another 2.7L 2000 car with the identical exhaust, intake and chip setup that I have and that car has never gotten any error codes.
I am wondering if it might be something with the mass air flow sensor, because when I read the P1275 code with a generic code reader, not the durametric, it says something about "air fuel mixture...." I forget the rest.
Any ideas would be greatly appreciated.
Ed
