SMOG FAIL

I Have A 2001 Hyundai Accent With 83,000 Miles. Just Took It In For Smog And It Didn't Pass. The Nox Was In The High 600's, Around 670-680...

My Car Failed Smog Now I Put New Plugs New Wires New Cap And Roter It Is Now Back Fireing And Idle Is Rough, It Ran Good B4 I Did All This...

It Failed Smog On Catalyst, Prior To Going I Had Starter Changed, He Said Maybe Due To Unplugging The Battery And Should Drive It. Is...

My Truck Failed The Fuel Evaporative Controls Functional Portion Of The Functional Check Smog Test. What Could It Be? And How Much Am I...

93 Dodge Dakota Truck, V8, Failed Smog, After It Warms Up It The Idle Becomes Rough, Has Good Power On Acceleration, Smog Test Had Hi...

My Vehicle Runs Fine But It Will Not Pass Emissions Test. How Can I Reduce The Amount Of Unburned Fuel At The Tailpipe? Fuel Pressure Gauge...

Engine Performance Problem 1982 Jaguar Xjs V12 Two Wheel Drive Automatic My 82 Xjs Will Not Pass The Smog Check I Bought It In '06 And...

So Here's The Problem My Car Is Having Trouble Passing Ca Smog Test. I Have Taken The Car To Two Different Mechanics And They Can't Figure...

What Can I Do To Resolve It? Please Help!

I Have A Problem With The Car Passing Smog Due To The Cel. P0341 - Obd-ii Trouble Code: P0341 Camshaft Position Sensor Circuit Range/...