Quote:
Originally Posted by BrandonSS
FWIW I had a recurring CEL as well (0300 IICR) and it turned out after 3 trips to the dealership that I had a hairline crack on one of my catalytic converters. This as after they replaced an o2 sensor and something else in attempt to fix the problem prior.
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That's the problem with the P0300. Just about anything that triggers the knock sensor will trip it. A loud enough rattle at the right time, boom, CEL.