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I have a code 25- fuel/air mixture lean for my 92 Lexus es300, how do I pinpoint what to change without spending too much money fixing everything?

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  • Cars & Trucks Master
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The code 25 will refer to the sensor/s that are causing the problem. The two obvious items are the oxygen sensors and the mass air flow sensor. Have the mechanic or service department explain what will probably be the fault as most cars have reoccurring faults that mechanics are familiar with. It doesn't cost to ask first.

Posted on Jul 15, 2013

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Posted on Jan 02, 2017

  • 1201 Answers

SOURCE: Check Engine Light On

have the 02 sensors checked

Posted on Jan 21, 2009

  • 49 Answers

SOURCE: 2005 Ford Escape Rough Idle - engine code state lean fuel mixture

I recommend getting a repair manual from an auto store for your vehicle. They run $15 to $20. It will tell you exactly how to do everything you asked and also give you the values that should be expected. Hope this helps.

Posted on Feb 08, 2009

  • 36 Answers

SOURCE: 92 lexus es300 knock sensor

Need to remove the upper and lower air intake manifold.  There are two knock sensors for the front and rear pistons banks.  If you plan to do this yourself it is about 1 to 2 hours.  While you are at it, there is a short coolant bypass hose sitting in the same spot, replace it.  Another problem with the knock sensor is the wire harness used to connect the two knock sensors into one connection sometimes wears out and contacts the metal on the engine causing false signals to the ECM, so replace this cable also.
Just did this last summer on my 99 ES300.  Pretty easy.
DIYr

Posted on Mar 16, 2009

  • 1 Answer

SOURCE: how to change lexus es300 2002 cabin air filter

I just changed the cabin filter of my ES300. I found the instructions on the manual, under airconditioning and audio. It's pretty easy to do. I bought the filter from Kragen's for $21.95.

Posted on Mar 27, 2009

hawk127311
  • 350 Answers

SOURCE: 2002 Lexus ES300 Check Engine Light

You can disconnect your battery for a short period of time, 5-10 minutes should do it. There is no guarantee that the check engine light will not come back on in time, but it will make it go away at least temporarily.If you go to Autozone, 99% of the time they will hook up a code reader and diagnose your problem. It may be a minor and/or inexpensive fix. Please vote appropriately and leave feedback. I hope this helps and good luck.

Posted on Oct 29, 2009

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93 lexus es300 has a white blue smoke coming out the muffler smells like gas really strong i was told it might be the ecu or possible fuel pressure regulator any help would really be appreciated


how cheap it would have been just to run the fault codes first and fix only what was necessary
run the fault codes now and see what you missed

Nov 15, 2015 | 1993 Lexus Es 300

1 Answer

Check engine lite on code p0174 lean 1 & 2 banks how do you fix this problem


Lean fuel mixture is a symptom, not a root cause. To figure out what is actually causing the lean fuel mixture to occur, some investigation and troubleshooting is needed. TAKING SOME TIME TO FIND THE ROOT CAUSE WILL SAVE YOU TIME AND MONEY.
usual suspects include:
air leak- vacuum hose or intake system or manifold
inaccurate air measurement- faulty maf or map sensor
fuel problem- bad gas, failing fuel pump, clogged filter, faulty injectors

Or, feel free to throw parts at the problem. It keeps checker and autozone open late on saturday.

Dec 10, 2014 | Cars & Trucks

1 Answer

How do I fix code 13 engine speed sensor Above 1000 rpm


Clearing the codes is simple that is done by removing the fuse of the EFI from junction box 2 for 10 seconds. Make sure to remove the jumper wire and switch the key off before clearing the codes.

Here are some common Lexus vehicles 1990-1995 codes:

Code 12 and Code 13 Rpm signal circuit fault
Code 14 Igniter signal circuit fault
Code 16 ECT control signal fault
Code 21 and Code 28 Main oxygen sensor fault (for ES300; SC300 & GS300 models)
Code 22 Coolant temperature circuit fault
Code 24 Intake temperature sensor circuit fault
Code 25 and Code 26 Air fuel ratio fault (for ES300 & SC300 models)
Code 27 Sub-oxygen sensor circuit fault (for ES300 CA & GS300 models)
Code 31 Low airflow meter voltage (for ES300 and GS300 models)
Code 32 High airflow meter voltage (for ES300 model)
Code 35 Barometric pressure sensor circuit fault (for GS300 & SC300 models)
Code 41 and Code 47 Throttle position sensor circuit fault
Code 42 Vehicle speed sensor circuit fault
Code 43 Starter signal
Code 51 Switch condition signal fault (for ES300; GS300 & SC300 models)
Code 52 Code 52 and Code 55 Knock sensor circuit fault
Code 71 EGR system circuit fault (for ES300; GS300 & SC300 models)
Code 78 Fuel pump control circuit fault (for GS300 & SC300 models)

Nov 18, 2014 | 1990 Lexus LS 400

2 Answers

Check engine light code 25


Engine Code 25, Air-Fuel Ratio Lean Malfunction.

it could be ther are many causes for this code and you must check for vacumm leaks.

Jun 19, 2014 | 1993 Lexus Es 300

2 Answers

Will a bad MAF on 92' Lexus es300 cause no spark?


No it will not cause a no spark condition.

Apr 26, 2012 | 1992 Lexus Es 300

3 Answers

1995 Toyota 4Runner. 4WD V6. Started running very sluggish with rough idle. Check Engine light came on and I checked on board diagnostiics. Read Code 25 Air/Fuel Mixture Lean and Code 26 Air/Fuel...


Sounds like the Oxygen Sensor could be faulty, or the fuel delivery system is going haywire for some reason (leaky or plugged injector on some cylinders).

The fuel delivery is controlled by the Oxygen sensor, though.

Good luck on this repair.

Feb 04, 2011 | 1995 Toyota 4Runner

1 Answer

To lean air mixture


You cannot lean out the fuel mixture without electronic modifications to the engine control unit. The mixture is controlled by the control unit which in turn is affected by several other sensors. If you believe the engine is running rich, have a professional check out the coolant temperature sensor, throttle position sensor and the exhaust oxygen sensor. These are the most common culprits of mixture issues. Electronic modifications are available for this vehicle but those same modifications may render the vehicle illegal for road use in some states and countries as changes to the fuel and emission control systems can cause the vehicle to exceed the emission control requirements. If in doubt, consult a professional workshop or vehicle performance centre.

Oct 31, 2009 | 2000 Lexus RX 300

1 Answer

The car doesn't have power when hit the gas pedal speed pick up really slow also have code of 171 sistem too lean on bank one,lexus 2000 rx 300


this code sets when air fuel ratio feedback is stable after engine warm up,and fuel trim is considerably in error on lean side;The signal from air fuel ratio sensor is approximatelyproportional to existing air-fuel ratio.

for this code suspect excessive lean condition,normal rangefor total trim is between -35% to +35%,DTC uses "two-trip detection Logic".

Check system for intake leaks,incorrect fuel pressure,plugged fuel injectors,O2 sensor or coolant sensor operation.

check air-fuel ratio sensors
to do it you need to check them with a good scanner tool.

also,check MAF sensor operation.

personally i would clean with the special spray for MAF sensor (you can get it from you autoparts store) and try a fuel injector cleaner before start spending money in shops.

hope this info can help you.

Sep 24, 2009 | 2000 Lexus RX 300

2 Answers

Check Engine Light came on with code p0420. Dealer wants $3900 to fix "b2 manifold and front pipes. Does this make sense. Are their better alternatives. I left the dealership without fixing it and the


if your car no present any problem i think that mechanic is a thieft.

Sometimes the fuel have mixtures that make the check light on , to reset disconnect the negative battery few minutes, no go more to this mechanic,good luck

Apr 20, 2009 | Lexus ES 300 Cars & Trucks

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