If Im not mistaken that code is due to a lean mixture which in turn can cause an engine to run hotter.Have you had the line pressure checked for the injectors. If you have pulled all the spark plugs are there some with colors different to others? Try switching sensors from one side of engine to other and see if code changes.Do front ones first then if no change swap rear ones. If change : bad Sensor. If not probably bad Cat. converter.
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