Fault P 0171, too lean??? ANY GURU´S OUT THERE
 

as above CEL was on so i went to the garage and they gave me this code.

I have APS induction kit 65MM APS FMIC ECUTEK bespoke map Devil turbo back de-cat, (Up pipe remains at the moment) on a MY 01-02 WRX.
I have a limmited knowledge around engines/ECU´s but is this most likely to be a fault with:

A: The map, its been done for 4 months now with no probs. However the ambient air temp has risen as the weather has got warmer.

B: The lambda sensor, getting aggro because its no longer sat happily snug in a CAT.

C: The sensor in the Up pipe.

D: The MAF sensor.

Ive checked all my hose/pipe connections before and after the airfilter, all the way to the turbo inlet.

Ive narrowed it down to possibly these on my knowledge of fault finding on Tank engines. LOL not much good but it gives me a fairly good idea where to start checking.

Thing is i dont know how to check B,C & D
Obviously i can check the map with a delta dash but im in germany without one.

Any ideas you experts out there?

Cheers Aston

Yes code P0171 means System to Lean (Bank 1)

What would be likely to cause this?
any of the above or if so which is most likely, or is it something completely different?

What ECU does the car have?

MAF...

I had a similar fault, system too lean "bank 2", think it was. Cant remember the number.

The wires on the Lambda had been damaged, rewired it, and it was fine.

Obviously your problem may be different.

The car is a WRX 01-02 with Tek 3 remap

Anybody?????

Anybody what? two people including myself have replied with a suggestion which you have ignored and not responded too..

Manners cost nothing FFS

ok im still trying to get all the ideas and previous problems, so i can find out what is the best route to take on sorting this out.
As you can see ive had several different answers.

Thanks