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2-3-1 and 1-3-3 codes on my wagon 200 1993

I pulled the diagnostic codes and cleared them. Here they are: 2-3-1 and 1-3-3. I see the 231 means fuel trim too lean or rich. 133 means throttle switch idle setting faulty. this popped up about a week following new plugs. have driven the car about 2 days since reset and check engine light has not come back on. car is running fine. false alarm? thoughts? thank you!






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