2000 4Runner Limited check engine light
#1
2000 4Runner Limited check engine light
Hey all, I'm new to the site. I have 2000 4Runner with the check engine light on. First of all, the truck has CA emissions. I am getting a code PO 171, lean in bank 1. I have replaced the O2 sensor, cleaned (not replaced) the MAF sensor, and seafoamed the gas tank. The engine light is still on, showing the same PO 171 code. I have also taken it into Toyota and had the 90k-120k mile maintenance done, including replacing the timing belt and water pump. I was wondering what else I can do to fix the problem. I also had to replace the muffler about eight months before the check engine light came on, but the guy got the wrong muffler, supposedly it was bigger and better than a stock one. I don't suppose this muffler, not being a stock muffler, could cause that code to come up as well? Any help with this would be greatly appreciated. Thanks!
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