My 1998 Saturn SL2 failed emission test with codes p0420 and p0340

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Carguy1 · Answer 1 · 2018-02-13T13:24:41+0000

The P0340 is a bad cam position sensor code, the P0420 is a faulty converter. Normally replacement of both is required to resolve the issue.

OBDIITech · Answer 2 · 2021-01-17T16:29:20+0000

P0420 SATURN - Catalyst System Low Efficiency Bank 1
Read more: https://www.autocodes.com/p0420_saturn.html

P0430 SATURN - Catalyst System Low Efficiency Bank 2
Read more: https://www.autocodes.com/p0430_saturn.html