[Shop-talk] PO174 - PO176 OBD CODES

[David Scheidt]

On Dec 7, 2007 10:07 AM, john niolon <jniolon at bham.rr.com> wrote:
> MY '03 Tahoe through a check engine light at me yesterday... reader shows
> po174 and po176 codes which are engine lean...both banks
>

PO176 is a fuel composition sensor fault.  Do you have a typo, or a
flex fuel truck?
PO171 is bank 1 lean.

Check for vacuum leaks first.  That's cheap and easy.  Then pull the
MAF and clean it.  You do this by spraying it with electrical contact
cleaner.  not brake cleaner, carb cleaner, snot, gasoline or anything
else.  Electrical contact cleaner or MAF cleaner (which, as far as I
can tell, is contact cleaner).  Don't touch the wires.

Which engine is this?  Some of them are known for intake gasket failures.



-- 
David Scheidt
dmscheidt at gmail.com