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My 99 subaru outback was rear ended causing bumper, body and frame damage (still driveable). A few days later the CEL came on and shows P0420 Catalyst System Efficiency Below Threshold. There's no obvious external damage to the converters. My question is could the impact have caused the cat failure and therefore be added to the damage claim? What evidence might confirm this? I'm the second owner and have receipts that show the original converters (front and rear) were replaced under warranty at 25,000 miles in 2001. The car now has only 68000 miles. Shouldn't they have lasted much longer? Thanks for any guidance.
Bill
Bill