Question about 1999 Lexus ES 300

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Mass air flow sensor not working properly

Where is the mass air flow sensor located in my 1999 lexus es300 coach edition? how do i determine if mine is the sensor with the variable valve timing or not?

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  • 168 Answers

Hi no more sin, the camshafts have the variable valve timing, not the
air mass sensor which should be a black box at the end of the air
intake snorkel closest to the engine.
get it scanned by a technician to make sure you get the right
information as to where to start.

Posted on Jan 03, 2013

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Posted on Jan 02, 2017

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BCally1
  • 133 Answers

SOURCE: Where is the Knock Sensor located on a 1994 Lexus ES300

  1. located on top of engine below intake manifoldgraphic.aspx?mod=reptiff&module_id=1&session_id=%7ba7aa889f-b7e3-42e1-9ece-3476a2533f69%7d&image_guid=95d24086&print_bw=0&

Posted on Jan 07, 2009

  • 36 Answers

SOURCE: mass air flow sensor replacement (variable valve timing)

The MAF is on the Air Intake above the air filter box and screwed into the plastic tube heading toward the throttle body.  It is the 2" by 2" plastic protrution from the air intake tube. There should be two philips screws holding this in.  Remove the two screws and back the entire MAF out.  There is a wire harness connected, unclip this to remove completely.
If you have money burning a hole in your pocket, go ahead and purchase another MAF for a few hundred clams, or you can spend about $10 and clean it.  It's made out of titanium and I doubt it will fail in 10 years.  But sometime it does happen.
Go to Lowes, or Home Depot and buy Electronic Cleaner in a spray can.  If you look inside the sensor, there is a heated wire, and behind that is another wire which picks up the oxidized air.
Stick the tube which is attached to the electronics cleaner spray can into the cavity where these wires are seen.  Continue to spray most of the can onto these wires to remove oxidation build up from the wires.  Let it evaporate for a few minutes then hit it again.
Allow the assembly to evaporate complete for about an hour.
In the mean time, take some throttle body cleaner and spray out the throttle body with the valve open.  Keep open to let it dry out quicker and clean up the black crud that come out.
Keep you air filter replaced.
Put everything back together and you should be good to go.
DIYr-X

Posted on Mar 16, 2009

  • 100 Answers

SOURCE: i have a 1996 lexus es300 that failed emissions with the following codes: P0100: Mass or volume air flow circuit; P0110:intake air temperature circuit P0135 02 sensor heater circuit (bank 1 sensor1

what was the first code present. that one code will chain react the rest .clear them let them come back on and they will then compare the order

Posted on Oct 26, 2012

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1 Answer

Do you know where the mass airflow sensor is located


Mass flow sensor - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Mass_flow_sensor
WikipediaJump to Hot wire sensor (MAF) - )[edit]. A hot wire mass airflow sensor determines the mass of air flowing into the engine's air intake system.Moving vane meter - ‎Hot wire sensor (MAF) - ‎Coldwire sensor

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what was the first code present. that one code will chain react the rest .clear them let them come back on and they will then compare the order

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locate your air filter box. a mass air flow sensor is ALWAYS in line between the air filter box and the throttle body. is there a percieved issue with this unit?

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Location of mass air flow sensor


The sensor is mounted on the throttle body between the air cleaner assembly and the air cleaner outlet tube.

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