p0420 caused by exhaust leak?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

99sho-time

SHO Member
Joined
Dec 15, 2015
Messages
390
Reaction score
97
k guys threw a p0420 I have all new 02 sensors was wondering before i get into a plan to fix. this I have an exhaust leak and was wonder could that trigger it? it's leader at the headers and I need exhaust studs.
 

SHOMEX

SHO Member
Joined
Jun 9, 2004
Messages
306
Reaction score
14
Location
Taylorsville, Utah
I will say yes, an exhaust leak like the one you described will thrown a p0420 or p0430 code depending on which bank the leak is; the most common cause of a cat low efficiency code its upstream o2 sensors or exhaust leak from the exhaust manifolds.
 

Forum statistics

Threads
107,088
Messages
1,181,315
Members
16,153
Latest member
lapochkarr

Members online

Back
Top