8/1
i recently purchased my o2 type s it had some mods already (header full exhaust intake etc.). my CEL was on throwing the p1164 primary sensor malfunction. i got a freeby o2 sensor from local junk yard, it was off an accord. four wire same plug, seemed to be flawless. cleared my codes and my CEL stayed off for a day and now its back throwing p0134 and p1164 code. everything i have researched said replace the A/F sensor bank one sensor one. My main concern is purchasing a new o2 sensor and it not correcting the CEL based on the mods done to the vehicle. i do have a high flow cat if it makes a difference. the local dealership tells me the only way to resolve the CEL is to go stock..........some1 help me please!!!!!!!!!!!!!!!!!!

9/1 So i finally bought a brand new primary o2 sensor and replaced mine. CEL is off until the secong ignition cycle. once i turn the car off the next time i start it somes on within 10 minutes. i can tell a big performance difference when the light is on. i know it is running really rich with that A/F sensor being out. i have checked my fuses and grounds. the code is p0134 no activity detected sensor one bank one. any suggestions are greatly appreciated. i need a K-PRO, anyone got a deal on one