That's not at all how obd2 works. There is a quite a lot more than just... Oh it has a fault for this. Must need to be replaced. If he's half a good mechanic he'll be testing to make sure the sensor with the fault is receiving mechanical input properly from whatever it's supposed to sense. Then that sensor has to send that info to the controlling module. He should be testing it gets received and interpreted properly. If something in that line of info isn't working, you've got a power, signal, and ground wire to test on the sensor, the module, and the plugs that connect them. And that's if it is something straight forward. There are far more annoying problems that only present intermittently. Not knowing what goes on doesn't mean nothing is going on.
That's not at all how obd2 works. There is a quite a lot more than just... Oh it has a fault for this. Must need to be replaced. If he's half a good mechanic he'll be testing to make sure the sensor with the fault is receiving mechanical input properly from whatever it's supposed to sense. Then that sensor has to send that info to the controlling module. He should be testing it gets received and interpreted properly. If something in that line of info isn't working, you've got a power, signal, and ground wire to test on the sensor, the module, and the plugs that connect them. And that's if it is something straight forward. There are far more annoying problems that only present intermittently. Not knowing what goes on doesn't mean nothing is going on.
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