Engine Performance problem
1999 Lexus RX 300 6 cyl
I'm working on a Lexus RX 300. It came in with a P0171 and P0325 code and the " Check Engine" light on. I put it on my Snap-On OBDII scanner and got a " Lean Mixture on Bank 1" code. I got the P0325 code off, but I can't solve the P0171 fault code. I feel like I've tried everything:
-Upper Intake Manifold Gasket
-Lower Intake Manifold Gasket
-Coolant Temperature Sensor
-Traced every Vacuum Hose, check for leaks
After all of these repairs, the customer says it runs great, but I can't get the " Check Engine" light to stay off, on top of the stubborn P0171 fault code.
I don't suspect anything wrong with the EGR valve because it idles well. My scanner should give me a code as well. I don't suspect the MAF sensor either because again, no codes show up on my scanner.