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SES Light on with a code of P0420

(2001 Pontiac Montana)
in Wilmington, OH on April 09, 2009
SES is on with a code of p0420. I can clear it then it comes back on after a couple of days.
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Popular Answer
on April 09, 2009
check out this article on this code and what it mans:
on April 10, 2010
Check for cracks near the o2 sensor near the exhaust manifold.
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