I've been going to 7 Days a Week Smog for years. On my most recent smog check, I hadn't noticed that the engine light was on. They told they'd wait on the Groupon and to just bring it back when the problem was gone and the error codes reset and ready. Very civilized.
I will say that they used to have better snacks in the waiting room—but it's amazing that they even have a waiting room, let alone snacks.
Full Synthetic Oil Change (Does not apply to European Oils) (Valid at Select Locations)
Great service overall, I was in and out in about 20 minutes.
Only small issue, tipping feels awkward. One person handles intake and payment, another does the actual oil change and follow up. I tipped at checkout, then the tech came out later, which made it unclear how tips are handled. Might help to clarify whether tips are shared. Otherwise, very smooth experience.