Hi all, 99 wrx with sti engine .i very stupidly reconnected my battery while ignition is on and now i have some gremlins. Car runs ok but now throwing an o2 sensor code. Sensor was just teplaced. Also speedo now works sometimes, jumps wildly sometimes and mimics the tacho at others times. Car runs fine sometimes but crap other times. Boost is also slightly down. Max 13psi. Have i fried ecu.