Close
Car Questions
RepairPal is your advocate for car care advice and guidance

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.
Displaying 2 answers & 0 comments
Popular Answer
on April 09, 2009
check out this article on this code and what it mans: http://www.aa1car.com/library/p0420_dtc.htm
on April 10, 2010
Check for cracks near the o2 sensor near the exhaust manifold.
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide. Learn more

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
I passed my emissions test back in April 2011 and check engine light is on? And I noticed that the car hesitated when...
I get flashing P0300 flashing code when driving above 60+ mph. New plus and wires, No problems with start, idle or e...
Didn't find what you were looking for?