n00b needs help; Computer reset?

[RedlegParatrooper]

Hi all -

Got a code: "P0171 system too lean bank one"

so, took truck to the Auto Skills Shop on post, (where we military types can do our own work and get access to shop tech and tools)

The dudes there looked up codes and confirmed what I thought which was Oxygen sensor.

Replaced Oxy sensor and disco'd the battery for the whole time I worked on the truck (3 hrs between sensor and new brake pads)

"check engine" light was off when I was done; Woo Hoo!

BUT: Check Engine light back on this morning. D'oh!

Please help!! What the hell?!? Do I need to have the computer reset another way?... Or?...

What gives?

Thanks!!

 

[gaz]

O2 sealant and leaks

You could use some electronic parts cleaner on the connectors for the O2 sensor (and the computer). If you used sealant on the threads of the O2 sensor you may need to redue it, this happened to me once. I wound up using the orange hi temp stuff real thin coat on the threads. You may also need to take a look at the "Y" pipe gaskets, there could be a leak.

 

[Sasquatch_Ryda]

That code is rarely related to the O2's at all.......The oxygen sensor is seeing a lean condition...it's not the cause.

The most common cause for this is vacuum leaks and misfires.