u/Faramir-

Hi there. My yamaha yzf r125 have been throwing these error codes with the engine light on. Motorcycle works fine otherwise. P0134: 02 sensor circuit. No activity detected Bank 1 sensor 1. P0507: Idle air control rpm higher than expected. When I bought the bike it came with an aftermarket black widow exhaust, so I’m thinking maybe something related to the catalytic converter wasn’t done right when they changed that. Maybe it’s the O2 sensor or something. I also noticed a little poof of air escaping from half way down the exhaust right where it is clamped to the rest of the pipe that goes into the engine. Could that be the reason for the errors? Bike rides fine otherwise, starts at first crank from cold and idle seems stable. Thanks for any help. 🙏