car runs too lean but i have to find out where to start with the diagnosis.
againe code po171

 

I recommend that you take it to a shop with a scope and monitor the O2 sensor and have them do an Amp Ramp on the ignition coil. I have heard of the intake manifolds leaking air right through the pours of the aluminum. Check the MAP sensor voltage while on a drive, this may need a scanner but you can graph the volts with a volt meter yourself at different RPM ranges, long test leads. I think that Emission warrantee is up to 8 years???? and have the dealer check for TSBs and then do your own search to see if they are not coming through on free repairs................................ TSB 00-018, here did a search for you.

 

Doesn't that car have an EGR system??

 

i figured out that the 2 o2 sensors were faulty one was working harder to pick up the slack.So the fuel reg was fucked too that was the code regulator and hose kit.