Infinity Q45t OBDII - PO306 Cylinder 6 Misfire Problem/Etc.

The first thing that comes to mind is that the repairing facility is staffed by some folks that need to have some customer service skills beaten into them! The traction control system has a warning lamp on, this is not in dispute, what I would need to determine is if there is a reason or reasons the TCS is setting a fault. Who knows? The system if activated by possibly setting the car on a dynomometer and spinning just the drive wheels to run the emissions test (in California, we dyno test most of the cars cars in most areas of the state) should either reset itself or should have been reset by the aforementioned customer service challenged repair facility, once again, shame on them. If the P0306 code was still present and causing trouble, the check engine light would still be illuminated. I would check to see if your state has a watchdog type system set up or actually call the state licencing board and see what they say. I am a firm believer in holding the "crooks" in auto repair accountable, the bad apples give the industry a bad name. And lastly, the standards that govern OBDII are such that the drive cycle, if completed to the car makers guidelines, should complete the readiness monitors and allow you to successfully complete the emissions test. I will be standing by if you need more assistance mate, good luck and do not be afraid to hold their feet to the fire!

The coil change has NOTHING to do with the TCS light being on, unless the shop did something, which makes no sense. The light should have been reset and if it is on, take it back and compel them to do the job you paid them for. Driving a properly repaired car that has had the check engine light reset, the repairs done in a complete fashion, and run within the parameters of what it will take to have the monitors run to completion should allow the test to run successfully. The state agency should be able to help in such a way as you're telling them what the problem is and having them respond. I dont think that I can tell you what that might be.

A) Correct B) Normally driving 75-100 miles would be more than enough. Paying ANOTHER fee for what they probably should have done to begin with, is not fair in my book. The fault that was set for the coil induced misfire should have been cleared, the car driven and scanned a second time to reconfirm the repairs were done correctly. For them to say give us another $125 is where the state regulatory fellows might help. I hope these answers are what you need.