Replaced my o2 sensor - P1115

[dcporsche99]

Hey CJ,
Very cool to hear! Unlike you, I had to change all four ASAP! I have actually been driving my garage queen these past few days that it has been nice in New York. I, too, am happy to report that after almost 200 miles so far, my CEL has remained off. But, of course, now that I have sent this info out into the universe....you know how that goes...lol!!

[dcporsche99]

"...I have been chasing a P1275 CEL code that I started getting when I put on 100-cell cats and had the car chipped. I also replaced all 4 oxygen sensors at that time. We have been playing with moving sensors and we even replaced one of the cats that the code reader said was running at a low efficiency. Like clockwork at 120-125 miles after we mess with the system I get the P1275 CEL again...

That made us think it was the cat on that side, which we replaced last week, I just put on 125 miles, and again got the P1275 CEL,..."


Hi Ed,
Just wondering about your code. Any new updates??? Let us know what you've come up with.

Thanks.

BTW, I see that you have posted an update. I just added it here: Help with P1275 Error Code.

[CJ_Boxster]

Well still no extra O2 sensor error codes since replacing only 1 o2 Sensor

[Rodger]

Several of my Subaru buddies are using these to prevent those annoying codes. Those 100-cell cats are probably not as good at scrubbing the HCs out of the exhaust as the stock cats, and the O2 sensor is seeing it. How about a blindfold for the O2 sensor? These actually work.

http://www.voodooboost.com/performance_accessories/O2_Simulator/

[CJ_Boxster]

Those are the exact same thing as buying a Anti-Fouler from the help section of autozone. Did that to my buddys RSX Type-S after we installed a header kit that eliminated the cat.

[steve00s]

These pull the existing sensors out of the direct flow of exhaust. I have been wanting to put headers on my car but have not found an affordable solution to the 4 sensors needing to be accommodated. For those of you that really understand how the O2 sensors work, will this prevent CEL's (at least in theory)?

[pecivil]

ed,

since I put on the headers/cats I get the P1115 and P1116 and P1117 and P1119. The o2 sensors were all replaced with new stock too when the headers went on.

My mech and I think the problem lies in having to lengthen the o2 sensor wires to get to the new locations in the cats. At least in my setup, he had to lengthen the wires for both of the post cat sensors. The resistance of the wires changes as they get longer, and that may be what screws up the sensor.

I know my sensors are good, but the fault keeps getting thrown. But the car runs like a top, so I dont worry too much. It would be nice tho if something could be done.