cat and o2 sensors
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Racetracks
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Re: cat and o2 sensors
If you're just replacing them with the same type, no. It would be a good idea to reset the ECU though, that way the ECU will start from scratch with the new sensor readings instead of having the old in memory and then trying to make sense of the new.. Just disconnect the battery cable before you start, by the time you're done changing the sensors the ECU will have lost it's memory and will be reset.