[tholyoak]

You just wasted money on replacing sensors that had nothing wrong with them. 1123 and 1125 are mixture errors. These are lean threshold limits being exceeded. What that means is your car is running rich and the computer has reached the limit in order to get the O2 sensors to read in range (does this by shortening the injector pulse). Probably a MAF problem. MAF is probably giving too high of voltage for a given amount of air and thus the computer thinks there is more air going in the motor than there actually is. Therefore, it is running richer than it should be and has to shorten the injector pulses over what the maps say should be for the conditions. Oxygen sensors are just reporting the condition, they are not the cause.

-Todd