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P0173 and P0125, which error code is this? My vehicle is a 2000 Mitsubishi Montero Sport 3.5L.?

Source: Yahoo! Answers

I know that the codes are for the O2 Sensors but, for which ones? Is it for the front or the rear of the catalyc converter?

  • The P0173 Fuel trim malfunction Bank 2 would be the drivers side front 02 sensor. The P0125 for GM vehicles states that there is not enough coolant temperature for closed loop fuel control. I'd check the anti freeze just to be safe. My guess would be the Bank 2 02 sensor heater circuit isn't working and a new 02 will... Read More
  • P0125: Excessive time to enter close loop P0173: Fuel trim malfunction (Bank 2)

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