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1lexus

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  1. OBD II ENGINE CODE: P0440 I have read several posts concerning engine code P0440; however, I have not seen any that address the problem I had with my 1999 RX300. When this code appeared I started reading and checking the recommendation that were posted; changing gas cap several times (aftermarket to OEM to another aftermarket), checking vacuum lines, replacing O2 sensors etc….this code would keep reappearing . I kept driving it until finally the real culprit showed up. The fuel line that attaches to the fuel injector rails and connects via quick connect just in front of the firewall under the brake booster started spewing fuel under pressure (35-45 psi). I guess in the beginning the leak was just enough to interrupt the sealed system but not enough to leak fuel (go figure). Since I had the air filter box and throttle body removed in order to replace the fuel line I also replaced my spark plugs with E3s. I have driven over 400 miles and no check engine light. My gas millage and power has increased noticeably. The dealer said that they had never replaced that section of the fuel line on any RXs…just my luck…. Here is the link that I found the parts....also has parts breakdown for all categories. http://www.lexuspartsnow.com/
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