sas4ever

i have an 2002 camaro 5.7 ls1 6spd
all stock other then the SLP upgrades
trying to get the car to pass inspection etc..
but the SES light stays on due to P0171 and P0174.
i have already replaced the Mass air flow sensor and was wondering if it would be both pre cat 02 sensors or if anyone has any thoughts..

willing to try anything..

GMRL

You most likely have a vacuum leak. With the engine running,can you hear any loud hissing sounds in the engine bay? Its common on these cars for the pcv hose that goes into the intake manifold to leak. Its in front of the pass side head and goes into the front of the intake.

lt1pwr1

iTrader: (1)

Will most likely be your intake gaskets leaking especially since it is affecting both banks

sas4ever

here is a pic is this the correct hose? and also would u think it would be a good idea to put new o2's on it considering the car has 98k

FiredUpZ28

Spray carb cleaner around the top end of the engine and listen for a change in engine RPM. Pre pre-cat 02 sensor exhaust leaks can cause it to pick up a lean as well.

GMRL

Thats the fresh air hose, while it can cause an issue.
The one under it is whay usually causes problems.
It wouldnt hurt to replace the o2 sensors either.