I installed a K&N filter kit on my 2005 Pontiac Vibe and now I got the engine code P0171

Question

I installed a K&N filter kit on my 2005 Pontiac Vibe 1.8L and now I got the engine code P0171, do I have to put the old filter back?

Answer 1

No you do not have to a lean bank code can be caused by MAF contamination just from  driving and use, do a MAF cleaning, this may help, What usually causes a lean bank code are vacuum leaks that are unmetered,low fuel pressure,or a MAF under reporting.

Answer 2

P0171 PONTIAC Code - Fuel Trim System Lean Bank 1
Read more: https://www.autocodes.com/p0171_pontiac.html