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1999 Lexus RX 300 Questions & Answers
1999 LEXUS RX300 41000 MILES CEL ON
what are the new codes clearing / resetting doesnt fix the problem the p0171 code has about ten different causes just changing or cleaning the sensor may not have been your problem
P0171 System Too Lean Bank 1 rescan and get all codes then look up each one most sites have causes and solutions for obd ll trouble codes
99lexus rx 300! Replaced 2 knock sensors and harness,2 cats,tranny flush, bosch platinum plugs, not iridium!! 11.2 litres Hwy,14.2 city Full tank of gas at $1.08 litre, 341k,not good ! Any insight!!
run the fault codes to determine if there are any sensors operating out of set parameters
your indications are that the HO2S sensors are not operating correctly or cannot set the ECM for the air/fuel ratio
could be a problem MAP/Baro sensor, faulty injectors (spraying and not atomizing), low fuel pressure or simply at 17 years old or a guestimate Klm of around 340,000 klms the motor is a bit tired
anyway run the fault codes first and then having a wet and dry compression test ( a qualified service mechanic will know what I mean) done will determine the engine condition
This a picture of the freeze frame for my 99 lexus Rx 300. I would like to know what it means and are these normal parameters?
Yes, looks normal, and good. Calculated load is not much meaning, as it changes constantly. ECT of, oh that is centigrade, not sure how that translates to Fahrenheit, but it may be low from not running long...
Your fuel trims (both short term and long term-STFT, LTFT) are very good-showing that fuel is not being added or subtracted by the computer to maintain correct air/fuel ratio. Fuel trim numbers should be close to zero. It is when fuel trim changes by double digits-either positive or negative-that there is an indicated problem. For example, say you had a vacuum hose leak- sucking in extra air to the engine- then you could see STFT number go positive by double digits-meaning the computer senses a lean condition and is adding fuel to compensate. But your fuel trims show the air/fuel ratio must be correct-no change in fuel trims-the positive 2.3 in LTFT is negligible- not a problem.
How do you turn off the battery indicator light on my dash?
Contrary to popular belief, the battery light can be on even if the battery and alternator appear to be working fine. It is located in such a place as to indicate effective charging. What that means is that even if the battery is good and the alternator is outputting voltage (and current), the lamp lights to indicate that the vehicle is consuming more power than the alternator is producing. This is important since once running, if the alternator cannot supply all the vehicle's power needs, the battery is drawn on for the remainder, and will suffer draining as such. Most manufacturers provide alternators that produce more than enough power to operate their vehicles, but many owners add additional high-power audio systems and other items that can overwhelm the factory unit.
You said the alternator was "tested"....was it load tested, or did they simply hook a voltmeter to it while the engine was running and saw 14.5 volts? This is important since a failing alternator may regulate its voltage properly, but may fall far short of the output current (power) needed to operate the vehicle.
It is possible that there could be a defect in the battery amp circuit, but it is such a simple circuit that I would be more suspect of a charging system issue than I would of a faulty battery light. And no, there is no reset for it - as soon as the power balance returns to the positive side (car needs less than is produced), it will go out all by itself.
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