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It sounds to me like you did a good job with the sensor replacement. I doubt it was the problem on your 93, but it is good to know it is new now.
The 113 is the CEL illuminator. I've had that many times and various causes. The book says the injectors cannot be timed such that the oxygen sensor reports a correct mixture, so all parts of the fuel management system get into the act, but so many focus on that word "injectors".
Using a meter on the sensor can give you an idea how that management system is functioning. You're looking for the voltage to regularly change between something like 0.1V and 0.9V. Using a digital meter to watch this behavior is driving in a downpour where you can only get a fuzzy glimpse of the road ahead immediately after each sweep of the wipers. A scope is needed to see the road full time.
But if that voltage does not change regularly, and the computer attempts to correct for some time, it will assume something drastic happened and set a limp-home program that essentially takes the oxygen sensor out of the picture. Now the engine management is driving blind. The wipers died. The fuel is now being managed by a computer programmer based on what the AMM, ECT, TPS, and RPM tells it, and though the engine runs, you're not likely to stay on the virtual road long, winding up in the ditch as far as air/fuel mix is concerned. The CEL tells you when you've arrived.
I've fixed 113's with manifold gaskets, oxygen sensor (mentioned that below), ECU replacement, AMM change, and most recently, a tank pump. Many others fix it by replacing the fuel pressure regulator. I'm hoping, with your laundry list, you've already got the culprit, and just need to reset that computer so it can start with a clean slate. If not, then look at that oxygen sensor voltage and see what the computer thinks at idle. The heater can be tested for operation too, by measuring its resistance at the two-pin plug after starting the car cold and immediately after turning it off from 1 minute of idling. You'll see the resistance drop as the heater cools.
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Art Benstein near Baltimore
By the time a man realises that his father was right, he has a son who thinks he's wrong.
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