I see this all the time, and I have had customers accuse me of doing something to their car so I could sell them a high-dollar catalytic converter. I'm not saying that this WILL happen on your vehicle, I am just saying that it CAN happen so you will not be confused IF it DOES happen. Then you will have to replace your catalytic converter to fix that. So it is possible that you can fix the wheel speed sensor thing, the O2 sensor monitors will complete, then when the catalyst monitor runs it could set a "catalyst efficiency" code. The computer does not know this yet because the catalyst monitor cannot run. Here's the kicker.If the vehicle has been driven in this condition for a period of time, there may be damage to the catalytic converters. The wheel speed sensor problem is keeping the O2 sensors from being tested.So the wheel speed sensor problem is pretty much causing the whole thing. The catalyst monitor can only run AFTER the O2 sensors have received a "clean bill of health" from the O2 sensor monitor. In your case, the catalyst monitor cannot run because the O2 sensor monitor is not complete. Also note that one incomplete monitor can prevent other monitors from running. In your case, the wheel speed sensor fault needs to be diagnosed and repaired so that the monitors will complete. The goal is for all the monitors to run and change to "complete" without any fault codes present. Once these faults are repaired, then the codes must be ereased so that the monitors can run and "re-test" the system to check for the same, or any other faults. Whenever Your OBD readiness monitors cannot complete it is because there is a problem that is affecting fuel mixture, ignition timing, or any other fault that can affect the level of tailpipe emissions. Also the WSS signal is used to detect rough road driving condition. The ECM uses this signal to control the fuel injection, ignition timing, transmission/transaxle shift scheduling and torque converter clutch scheduling. The signal generated by the WSS informs the ECM not only if the vehicle speed is low or high but also is stopped the vehicle or not. The Wheel Speed Sensor (WSS) generates a waveform with a frequency according to the speed of the vehicle. Diagnostic Test Code (DTC) P0501 "Vehicle Speed Sensor Range/Performance"
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