Hi everyone just wanted to see if anyone has dealt with this problem before.

But I was driving home on the freeway and all CEL/Check VSC/Traction Control Light came on. Took the car straight to Autozone to get the code read and it came out as P0171 (System too lean. Bank 1) Just for extra context. I just recently did an air filter replacement with a OEM filter. Car is a 2004 Lexus LS430.

Any guidance is appreciated. Thank you!

 

Do a search of this LS-3rd Gen. forum using the search term "P0171" and read thru a few of the resulting threads with that trouble code number in their titles AND those with lots of replies to them.