Seeking expert advice on this problem. 04 G coupe with Z-tube K & N drop in filter, Berk HFC's , megan racing Y-pipe with a Apexi WS2 exhaust. 6 months after the Berk's were installed which was the final mod on the car. Everytime is rains really bad the SES light comes on for 02 oxygen sensor , high voltage code 0138 and the car went into limbo mode with a weird idle. I had my mod shop replace the oxygen sensors and car runs great again but, light came back on 1 week later after in rained. My shop has since not wanted to help me out with this problem after they replaced the sensors anh left me to deal with this issue on my own after all the money I have spent with them. I purchased a cheap code reader online just to clear the SES light. I cleared it once but , came right back on because the same code was pending. Did some research and realized that you have to wait a number of drine cycles to let the code register before you clear it. So after it registered I cleared it. Then came a big rain storm and SES came back on same code. Car runs normal despite SES light.

Please help,

KT