Question about 2001 Lexus RX 300

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Check engine light is on

I have a 2001 Lexus RX300 with @ 75K miles on it. The check engine light went on followed by the VSC. Brought it to the dealer where the computer reads: Code P0171, P1130 A/F sensor B1S1 and MAF sensor 2.00 replace both sensors and clear codes. Authorized work and vehicle returned. On the ride home, light goes on again. Returned vehicle next day to dealer where they inform me of the following computer read: P0125, P0174, P1150, P1153 A/F sensor B2S1 1.50 replace sensor and reset ECU. I pick up the car after the repairs. Two days later after driving the vehicle, light is back on again. Do they know what they are doing ? What do you think is wrong. Now they are alluded to catalytic computer. Please help !

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  • Joseph DaMico Apr 16, 2009

    My error on the catalytic concerter phrase. To date, the dealer has replaced the Bank 1 and Bank 2 Air Fuel ratio sensors and the Mass air flow sensor.

  • Joseph DaMico Apr 23, 2009

    Dealer now says that there is a broken stud at the manifold which is causing an exhaust leak that is affecting the oxygen sensor. Says that I need to fix the stud before they can get an accurate reading. Estimate = 6hrs of labor totalling @ $750

  • Joseph DaMico Apr 23, 2009

    They have to pull down the exhaust to get to the stud.


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No such thing as a catalytic computer... there is a catalytic converter ... part of the exhaust system so they may now be "guessing" that it's an O2 sensor. take the car to autozone... they will scan the codes for free.... post the codes here tho the lads and lasses there are pretty clever and will probably tell you what the codes mean.

Posted on Apr 16, 2009

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  • Roberta Smith
    Roberta Smith Apr 16, 2009

    be that as it may stop by autozone if you are in the states.... and have them scan the car for the codes...


    Would appreciate if you took a moment to rate this solution as well.... thanks

  • Roberta Smith
    Roberta Smith Apr 23, 2009

    Not sure how they can justify six hours labour

  • Roberta Smith
    Roberta Smith Apr 23, 2009

    i'm aware of that .... but six hours seems to me excessive


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I had the same situation a couple of times. It happens a couple of days after air filter is changed. The first time, I took it back to dealer, they did the reset, and VSC and Check light went off. The second time, I just leave it there. After two weeks, lights went off. This week, I have this situation for the 3rd time. Still wait for them to go off automatically.

Posted on Jul 30, 2010

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