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Check engine light NEVER comes on

edited February 2012 in Repair and Maintenance
I have a 2000 Toyota Camry that has a unique problem. The Check Engine light NEVER comes on even when first starting the car. I have access to a scanner and know that the car periodically throws a catalyst code but the light never comes on. I just assumed that the bulb was burned out.

Today while solving a non-working clock issue I had to take the instrument cluster to get to the clock. While I had it out I decided to check the Check Engine Light bulb. It looked fine so I took I replaced it with a bulb that I knew worked fine. Again, nothing. The bulb doesn't light at all. About 4 weeks ago my timing belt broke while driving (thank god for a non-interference motor) and it threw a code for the camshaft position sensor but again the light never came on.

Anyone have any idea as to why the light never comes on?
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