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failed emission test with codes p0420 andp0340

Vehicle: 1998 saturn sl2
asked Jan 25, 2013 by anonymous

1 Answer

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.
answered Feb 13, 2013 by Carguy1 (2,881 points)
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