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So i failed smog, i was told that my o2 sensor was failing.
So my dad swaps out my o2 sensor but then he connects the positive and negative together even though i told him not to.
The check engine light is still on, so i reset my ecu.
The light goes away (comes on randomly)
Then i go smog, and I fail horribly, my emissions doubled.
My first smog i was passed 25mph, but failed the 15mph NO.
Second smog I failed the 25mph, and now am a GP at 15mph.
Do I have to get a new ECU or something? any advice is appreciated.
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