Chrysler Repair Questions? Ask a Mechanic for Answers ASAP
The key here is if the wire was tested at the PCM or just the sensor. If he tested it where it comes out of the computer and there was only .3 volts, then his diagnosis is correct. If it was tested out at the sensor, then it's quite possible there is a wiring issue between the sensor and the PCM.
You need to find out where the test was done to determine the PCM is bad. If it was done right at the computer, then I agree with the tech and the PCM is the place to start.
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I think it would be fine to continue to drive the car with this issue for a while. You're right about the fuel mileage of course, but it should not damage anything else. My only concern to be honest is that if this has burned out at the PCM, what circuit might be next in the box? Personally I doubt you will need the O2 sensor since this is not directly a problem with the O2 sensor, but your guy is right, no way to know really until it's back up to par.
I don't see aftermarket as a problem or even a used one to be honest. Either should work, you may need some reprogramming done at the dealer either way is all.
Well, since the fuel mixture is really what the O2 sensor is going to control it's probably not going to be a drastic reduction in mileage. The car will use the factory defaults that are in the computer for the reading essentially.
Things like a clean air filter, properly inflated tires will improve the mileage and a good set of spark plugs as well. But these should be done anyhow.
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