Question about 1999 Lexus RX 300

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1999 lexus rx300 check engine light blinking - car vibrates at about 50 mph but if i tuen off overdrive it will stop - got error codes P0125 and P0306

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  • zzzslb Oct 19, 2010

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Your 306 code means you have a misfire on cylender 6. That may be the cause of the po 125. Inspecdt the coil, spark plug wire, and spark plug on cylender 6. With the age of the car I would replace all 3 items. If you want know how to test all 3 I can tell you process of elimination is the way to do it. Do you know how to find cylender 6

Posted on Oct 15, 2010

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Aug 30, 2017 | Lexus Cars & Trucks

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Lexus ES300 Shakes/Vibrates At 45 MPH


Major transmission problem. That's what the flashing Check Engine light means.

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Would knock sensor codes cause my 2000 lexus rx300 to act like it's not getting enough fuel and the overdrive to not work?


knock sensors are significant sensors for timing advance. if the engine is knocking then the computer will retard the timing thinking that it is pinging and you can lose well over 50% power. sometimes the sensor picks up other vibrations and creates timing problems even if the engine itself is not at fault.

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Steering Wheel Shaking at 50-60 MPH


I doubt these problems have anything to do with each other.The shaking steering wheel could be an out of balance or bad tire(torn belt),a bent wheel,or improperly tightened lug nuts(not torqued evenly).The check engine light will require a code scanner to see what the code is.(if you work on your own cars,you might want to buy at least an entry-level code reader/clearer,some are under 50 bucks).

Oct 06, 2012 | 1999 Lexus ES 300

1 Answer

I have 3 codes 1) P0500 2) P0125 3) P1135 1999 Lexus RX300


The PO125 is an indication of an engine running too cold-as if the thermostat were stuck open.For some reason it often sets with the PO1135 even when the engine runs at normal temp.A scan tool will indicate exactly how hot the engine is,don't trust the dash gauge. The PO1135 is a heater circuit fault in the bank1 sensor1 air fuel ratio sensor or oxygen sensor. Bank 1 is the REAR bank on this car...that O2 sensor is not much fun.PO500 is a vehicle speed sensor fault-does the speedo work correctly?it is located in the transmission near the back of the case. once again the scan tool will read vehicle speed and can aid in further diagnosis.

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1 Answer

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1 Answer

High RPMs


yes its related to knock sensor because car is running rich in fuel, and car runs of on safe mode, so overdrive will be off. have you and a friend replace it. remove intake assembly, then intake manifold, but first remove your anifreeze from radiator, trust me you want to remove antifreeze! their are brackets by the fire wall to hold down the manifold, thats the hard part is taking it off and putting that on since not to much space to work on it. on the block you'll see the two knock sensors, has 2 wires each, knock sensors cost between 150- 200 a piece, still cheaper than dealership putting it on. also buy some liquid gasket because you will need that. after putting it all back together reset the ecu and you should be fine,

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