Hello, my speedo keeps dropping to zero causing my gearbox to jolt. Found the ABS sensor used for speedo and replaced. Also measured resistance of cable from ABS module. These were not the fault. ABS light rarely comes on, if at all. Any ideas? It is also stuck in open loop fuelling with fault codes showing O2 sensor control problem on both banks. Not sure if connected. Was OK, and then suddenly these faults. Thinking mabe ABS module. Any Ideas?