Lexus Troubleshooting Questions? Ask a Lexus Expert
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first, what brand was the converter??? most come with 5 yr 50k warranties for check engine light.
then it should have warranty...
could it cause the failure??? yes but highly doubtful. they fail from rich mixtures where un burned fuel which burns out the interior of the converter.
when was it replaced and what was the miles???
the part should have a separate warranty. find out where and what brand converter they used