2001 Pontiac Montana Q&A

2001 Pontiac Montana Question: SES Light on with a code of P0420

SES is on with a code of p0420. I can clear it then it comes back on after a couple of days. -
Answer 1
check out this article on this code and what it mans: http://www.aa1car.com/library/p0420_dtc.htm -
Answer 2
Check for cracks near the o2 sensor near the exhaust manifold. -