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mike, ASE Certified Technician
Category: Chevy
Satisfied Customers: 55
Experience:  24 year exp. GM world class cert. ASE master
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2002 chevy monte carlo 3.8 liter check engine light on code po171 and po420 retr

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pulled code po171 and po420 what is the cause
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the cat has already been repaced do you think it is a possible intake leak

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how about the po171

GM Master Tech 01, GM Master Technician
Category: Chevy
Satisfied Customers: 337
Experience: GM certified master technician 10 years experience
GM Master Tech 01 and 3 other Chevy Specialists are ready to help you
Customer: replied 7 years ago.
Relist: I still need help.
is po171 a possible intake leak

hi p717 is a lean condition on bank one common problems for this can be intake gasket leaks and vacuum lines open due to cracks or left off. also poor fuel delivery on injectors 1,3, or 5. i hope this is of help if you have any further questions please ask

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mike, ASE Certified Technician
Category: Chevy
Satisfied Customers: 55
Experience: 24 year exp. GM world class cert. ASE master
mike and 3 other Chevy Specialists are ready to help you