Just yesterday I installed the C&L Street with the X3 Brenspeed 93 tune, took the car out drove it around every thing was working fine. but later I again took the car out and got a check engine light. I hooked up the X3 tool and it had one code "PO171 System too lean (Bank 1)". Do any of you guys have any advice? I had gone through two tanks of 93, before the install.

 

I would give Brent a call ASAP.Check for any kind of air leak as well.

 

Common slip-up possible: check the vacuum hose, is it connected?

 

My thoughts also. Double check all of your connections, hoses and clamps. Delete the code and go for another drive to see if it returns. If it does call Brent @ Brenspeed.
Scott

 

I checked and retightned the connections including the vac line everything seems OK, I cleared the check light and went out for a 15 min ride getting on it and everything, came back no check engine light. Then 20 min later I go to a friends house and the light comes back on

 

Same problem with me but only it was Bama's tune that did it for me... A lot of ppl told me it was the O2 sensors... I haven't had time to check it out but it could be that too.... Good luck



-John

 

Have the O2 sensors been turned off as part of the tune?

 

Brenspeed put a sticker on the outside of the X3 pack that has (the rear O2 "ON" ) check marked. So I take that as, it is on.

 

It sounds like the air transfer function might be off. Did the tuner program the tune for the correct CAI kit?

 

Yup, sounds like you have to disable your o2 sensors on your Xcal or have Brenspeed email you an updated tune with them off.

 

Brenspeed sells the X3 now?