Code p0420-430 refers to both cat converters (bank 1 and bank 2)--efficiency below threshold== cause cat converter- wiring --- Ho2s. As cat converters are subject to cracking and failing and thereby not doing the job I would suggest having them checked and replaced if necessary. A local exhaust shop should be able to do the job . If they are cracked/broken there will be a rattling sound when the exterior is hit
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Code p0420-430 refers to both cat converters (bank 1 and bank 2)--efficiency below threshold== cause cat converter- wiring --- Ho2s. As cat converters are subject to cracking and failing and thereby not doing the job I would suggest having them checked and replaced if necessary. A local exhaust shop should be able to do the job . If they are cracked/broken there will be a rattling sound when the exterior is hit