check engine light is off, has been on over a year, why?
I have a 2000 Toyota Camry bought it in June 2007. January 2008 the check engine light came on until yesterday (04/0510) when I turn on the car the light is off. Why? Also, the letter "D" in the dashboard for drive is off but the others are not. The lights work for all gears for the gear shift. The light to replace rear taillight is on the dashboard. The code read p420 for check engine light. I have had only one oxygen sensor replaced. Should I replace the other and/or the catalytic converter? I have had regular oil changes, etc. My mileage is 118, 610 know. 4 cycl, automatic, LE 4 door Camry. I have had no problems driving, starting, shutting off, etc. Has never been in an accident. What is wrong with my car?
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