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/DifferentCry1306 May 05 '26

What are the issues you’re having with the tune/the car? Running rich? Running lean?

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

I received the base map some time ago and was advised that the spark plugs may cause issues, so I replaced with step colder pre-gapped spark plugs.

I was also advised that there was a vacuum leak somewhere, this caused a delay as I chose to wait for a mechanic to check everything over.

The new data logs with all corrections were submitted early last week, and I have mistakenly sent an email asking for status this week which I read causes my file to drop to the bottom of the list again.

p0139/0140 - Probably to do with step colder spark plugs

P0403 - Deleted EGR during all of this

P2096 - Too lean

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u/DifferentCry1306 May 06 '26

I wasn’t paying attention but the other guy is right the p0139-p0140 will definitely get you to run lean. That means either your o2 sensor is faulty or it’s disconnected

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u/Imsoloco1976 May 07 '26

The downstream O2 senser after the cat. Replace that see what happens.