Hello,i`m Having Tough Time Passing Smog For My 450 Sel Here In California,on The Smog Check Report Says (meas Reding To Excede Tollerance ) Anybody Had Have The Same Experience ??
New Cat Spark Plugs Wire Cap Rotor ,car Runs Smooth,like New,can Not Understand Why Can`t Pass Smog Check.......

Thanks

Marino