I seem to remember reading that these new system pump raw diesel in the exhaust to burn during the regen process. and that it is only to happen at highway speed. I thought at the time wondering how many fires would happen. I had my first car with the catalytic converter catch fire to the front yard . Had pulled into the yard went into the house for lunch. next thing i new fire trucks around. Firemen said the cat caught the grass under it on fire.
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