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you could get a new cat...then run the car with 91 octane it will lower the nox...then there are the egr solenoids on the back of the motor near the firewall check those out....mine was failing smog for the same thing...but i bought a cat and i ran the car but i still failed at 15mph and 25mph...what i found out is that my nox would only lower down at 16 and a half miles per hour to literally below 100 on nox readings...which kinda sucked since the test is only at 15mph..so you could get a smog shop to diagnose your car then tell them to check to see if the nox drops down at 16 and a half miles per hour....thats how mine passed i had to smog it on first gear....good luck!!
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