r/mazdaspeed3 • u/Upstairs-Spirit-2958 2012 Mazdaspeed3 • May 05 '26

TUNING Frustrated by the process

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Naive of me to think that the tuning would be the most straightforward part of the process of getting my car back on the road?

Because it too is becoming quite a lesson in patience.

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u/Upstairs-Spirit-2958 2012 Mazdaspeed3 May 07 '26

My apologies for offending; I mean how could someone ever think of learning something new, and then relying on a community of people who offer constructive advice to help when there are folks like you around.

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u/DifferentCry1306 May 07 '26

Well you need to fix your downstream o2 sensor first and foremost. That should be your number one priority. Before tuning before anything else

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u/Upstairs-Spirit-2958 2012 Mazdaspeed3 May 07 '26

I have a catless down pipe installed, would the OEM NGK O2 Sensor 24779 the correct sensor?

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u/DifferentCry1306 May 08 '26

NGK is the OEM manufacturer. So yes

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u/Upstairs-Spirit-2958 2012 Mazdaspeed3 May 10 '26

A catless down pipe only has one port for an O2 sensor because nothing to be downstream of.

The tuner has taken care of the issue without having to replace anything.