I just bought an 81 celica ST. Yesterday after running some erands I parked my car for like 30 minutes, when I started it again to go to class the sensor light was on. I searched this forum to see if anyone else had commented but I couldn't find any threads. It's a really old car so I'm not suprised but I was just wondering if there is anyway to get around buying a new O2 sensor (they're fairly pricey if I remember right). I only have to pass emissions for one more year but I want this car to last too, it's only got 130,000 miles. I know I can reset the sensor but I'd kind of like to fix the problem. Thanks for any help.