A while back I bought a '14 Evora S with a Komo Tec 430 kit. I've been fighting with it constantly trying to track down what's causing O2 sensor and mixture issues, which either result in a CEL or limp home mode (the 4500 RPM limiter). Most of the codes I've received are either P0174 and P0171 (too lean, bank 2 and 1 respectively), and P0153 (O2 sensor slow response, sometimes in conjunction with one of the previous codes). Most often they tend to happen under light load every few hundred miles of steady highway speed cruising - the car isn't being pushed in any way.
I've installed GRP's O2 sensor standoffs on the two rear O2 sensors, and it seems like they may have helped a little bit but it could just have easily been my imagination. I've been logging the data from the O2 sensors from time to time, and I wasn't able to spot any difference in the O2 sensor voltages when the issue happens. Because it affects any of the O2 sensors seemingly at random, I don't want to point a finger at one of those being bad - especially when I can't catch the issue logging their voltages.
Since this does have the KT tune... IIRC some of the tunes mess with the MAF readings. Is this a possible cause given the conditions (or lack thereof) that result in the code are related to this? If that's the case, what's the fix? Can an independent shop re-tune the car based on the KT tune I have on it?
I've installed GRP's O2 sensor standoffs on the two rear O2 sensors, and it seems like they may have helped a little bit but it could just have easily been my imagination. I've been logging the data from the O2 sensors from time to time, and I wasn't able to spot any difference in the O2 sensor voltages when the issue happens. Because it affects any of the O2 sensors seemingly at random, I don't want to point a finger at one of those being bad - especially when I can't catch the issue logging their voltages.
Since this does have the KT tune... IIRC some of the tunes mess with the MAF readings. Is this a possible cause given the conditions (or lack thereof) that result in the code are related to this? If that's the case, what's the fix? Can an independent shop re-tune the car based on the KT tune I have on it?
