Okay so i have 2 codes

P0170
and P0171(Pending)

I just replaced both my o2 sensors with Honda Replacement o2 sensors from honda

The engine is pretty much bone stock
just an intake is the only upgrade.
i have replaced all of the following in the past 2 months

fuel filter
spark plug wires
pcv valve
oil
oil filter
spark plugs
cap and roter
both o2 sensors

So if anyone knows what could be wrong or could give me a point in the right direction i could look in i would greatly appreciate it

P0170 - Fuel trim malfunction (Bank 1)
P0171 - System too lean (Bank 1)

Normally these are associated with a bad O2 sensor but, since you replace it already i'd say check your injectors...is your car running bad?

the car has been running fine.
the only problem i have had is
when im in high rpms i hear a high pitch sound
which tells me its a vac leak but when i listen under the hood its coming from my intake
and i have sprayed starter fluid over all my lines
and nothing came up

Can you be a little more descriptive on the high pitch noise?

If you can hear a leak at idle then the best way to narrow it down would be pinching off vacuum lines one by one. Don't forget the brake booster supply line! Then i'd say if nothing turns up check your MAP sensor o ring.

Oh and you definately don't have any exhaust leaks....right?

Yup definitely no exhaust leaks.
What is the best way to check my injectors?

^^^ if there is a leak at or before the O2 it will read lean! Just make sure....save you a lot of headaches

As far as the injectors go ( which i doubt, cause it's rare on a civic ) get a fuel pressure gauge and watch it, at the same time unplug one of your injectors at a time and watch the pressure difference ( needs to be done quickly ) they should all be around the same if you find one that doesn't change as much or not at all....BINGO

oh and before you do this....check your plugs! is there one that is different than the others? if so could be the problem cylinder

This post was last modified: 05-04-2008 12:51 PM by Cardr.

the plugs are all pretty new.
i have ngk plugs.
i am going to check for vac leaks tonight at work.
and i am also going to check my map at work.
now if there was a leak in the header im sure i would be able to hear it
which i dont.