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I have an 03 spec v ser and I was wondering if programming my car can hurt my ecu or anything. I can’t find a good brand programmer cause apparently Nissan didn’t want you to mess with it? I found a cheesy brand that says theirs works but I don’t want to harm the car.
 

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Sup Mod keeping the peace
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It's best not to mess with these plugin programming devices. Just a waste of money and they can "brick" the ECU so that the engine doesn't run anymore.
 

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NF Mod/Nissan Master Tech
2006 Pathfinder LE, 2003 Frontier SVE
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10,036 Posts
Usually the unavailability of a tuner or programmer exists because there isn't much of a market for it, rather than being because of something to do with what Nissan wants. If you can't find a tuner, you may be able to get a custom tune through UpRev, as they work a lot with Nissan models.
 
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