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2000 Rx300 Loss Of Gas Mileage

mileage loss rx300 gas

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#1 TPH

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Posted 16 March 2013 - 04:26 PM

Can anyone help with a sudden loss of gas mileage in a 2000 RX300 AWD. It dropped from just below 19 MPG to 16 MPG almost over night. Have cleaned the mass airflow sensor and changed the thermostat - was heating up slowly.  Any other ideas??  No trouble codes. Runs well.



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#2 lenore

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  • Model: 2008 Lexus RX400h 2nd Lexus
  • Year: 2008
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Posted 17 March 2013 - 09:31 AM

checked the usual, tire pressure, air filter, and dont forget the change in fuel from winter to summer blends....With no cel lights hard to diagnose



#3 TPH

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Posted 17 March 2013 - 10:02 AM

Just had the CEL come on this morning on the way to work.  Code 1150.  I believe this is the Air/Fuel ratio sensor on the front bank of cylinders.  Bet that could make a difference in mileage.  Thanks for the input have checked all the other typical culprits.  Was about to remove wheels and check for dragging brakes.



#4 lenore

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    papa x9 2boys, 7 girls love them all

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  • Model: 2008 Lexus RX400h 2nd Lexus
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  • Location: California (CA)

Posted 18 March 2013 - 10:08 AM

see this

http://www.clublexus...uel-sensor.html




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