Need help with engine codes! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

WELD4DAYS · 07-15-2008, 06:30 PM

I have a 2002 Silverado with 4.3 V6,5 speed.My engine light has been on for awhile.It is using alot of gas and it's missing when you drive it.The first code is P0102(mass air flow low input).The secon code is P0420(catalyst bank 1)something like that.I've heard it could be the Mass airflow sensor,or maybe the O2 sensors.Can someone help me on where to start looking for the problem.It has lost power.It has about 80,000 miles on it.I don't want to buy sensors that I don't need.Please give me any advice you might have.Thanks alot.

07-15-2008, 06:30 PM	#1
WELD4DAYS Registered User Join Date: Nov 2007 Location: Phoenix,AZ Posts: 107	Need help with engine codes! I have a 2002 Silverado with 4.3 V6,5 speed.My engine light has been on for awhile.It is using alot of gas and it's missing when you drive it.The first code is P0102(mass air flow low input).The secon code is P0420(catalyst bank 1)something like that.I've heard it could be the Mass airflow sensor,or maybe the O2 sensors.Can someone help me on where to start looking for the problem.It has lost power.It has about 80,000 miles on it.I don't want to buy sensors that I don't need.Please give me any advice you might have.Thanks alot.



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