Newbie here, so be gentle. Tried search, but came back with no results on SNG. Just bought my daughter a 1999 S70 with 119K miles that is in really good shape. My independent mechanic told me about the car that another customer of his was selling. He said I would probably have to do O2 sensors and a cat at some point, but the car had been well maintained. Trying to find any feedback on SNG sensors because they're considerably less expensive than Denso, which I know is the best sensor out there. Forgot to add, it's the base model with normally aspirated engine.