Question about Lexus ES 300

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Engine running fine. Had Advance run a scan and they came up with codes 171 and 174. He cleared the light and it didn't come on again. I am about to go on a 800 (one way) mile trip and am concerned.

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  • Lexus Master
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These codes can be caused by loose vacuum hoses or leaking intake manifold gaskets. Unless the leak is bad, it will not usually affect the performance of the eninge other than to run a little warmer than normal. The condition is not likely to worsen significantly over 800 miles, but I would check for leaks if I were you. To check the gaskets, start the engine and spray starter fluid on the gaskets. If the engine speeds up, there is a vacuum leak where you sprayed. OK?

Posted on Oct 13, 2010

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  • Lexus Master
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Actually, it sounds like you have a lean running condition related to a bad oxygen sensor or a vacuum leak in the intake manifold. I strongly suspect it is just a torn or loose vacuum hose going into the intake manifold. This is a common problem on toyota and lexus cars and trucks. Usually, it is either the PCV or EGR valve hose connection that has cracked or come loose, so check that first.

The above is from http://answers.edmunds.com/question-My-2001-Lexus-RX-300-is-posting-scanner-codes-PO-171-PO-174-PO-1130-and-PO-1150-What-is-the-most-likely-fix-43135.aspx

Posted on Oct 13, 2010

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