P0301, P0300, P0171 TODAY. Only p0171 was detected yesterday. 1999 LEXUS RX300. 120,000 mileages. Had both knock sensors changed last year.
Do u have a oil leak are u putting cheap oil
Engine misses, 300 and 301, are possible catalytic converter damaging events. Vacuum leaks can cause all three of the codes to set. Low fuel pressure can also. Look for any disconnected vacuum lines, EGR valve stuck open or loose mounting bolts, Mass Air Flow contaminated causing false reading, ignition coil may be weak or fuel injector may be dirty/restricted in the number one cylinder . Have fuel pressure checked to see if it is too low causing lean running.
This might fix the P0171 code cheap and easy
SOURCE: 12 codes; 90174, p0171, p0175,p0300,p0301, p0302,
I would be very hesitant about just going in and replacing parts/sensors, especially those diagnosed from Electronic Control Module (ECM) Diagnostic Trouble codes (DTC's) alone, as quite often when multiple codes are present, they are often related to a songle malfunction/failure (Such as coil codes, and O2, rich/lean codes, etc...) - A p0171 and 0174 code is not indicative of a faulty MAF sensor - it is a code set when a lean condition is detected within the vehicle's exhaust...often caused by vacuum leaks, EGR valve malfunctions, BAC/IAC ( Bypass/Idle air control) valve malfunction, DPFE sensor malfunction, or the MAF "hot wire" is dirty, and can be cleaned with the correct cleaner, but instead of replacing a $250 MAF sensor; only to later find out that if you had the vehicle repaired by a trained technician, a $3 vacuum hose and a $50 ignition coil had initiated the multiple DTC's - So, sometimes it does pay to use a trained technician; especially with so many codes present - Like I said - If I were going to do the work myself, I would erase all the codes (Disconnect battery cable for about 10 mins - this will also erase the block/learn ECM settings and it may search for idle for a bit, but will straighten out with time - reconnect battery and start the car - then after the light re-illuminates, re-pull the codes, and most importantly test the sensors/parts indicated by the DTC's before replacing anything - that is if you want to fix it the most cost effective way possible, but, if you have plenty of money to waste you could always just go replace whatever the DTC's tell you is out of specifications, regardless of the cause...this might fix it, but may not as well - if you got lots of money and feel lucky it's the way to go - if not, test those parts and sensor before replacing them - there is a process for testing each of them....Thanks
Testimonial: "Thanks you so very much. The car was shaking and making a knocking sound and running very poorly and now the engine is locked I had in towed home."
SOURCE: 2000 Lexus RX300 6cyl 3L VVT-i "Engine Codes"!
The first and last code are your start and stop so you can ignore them the P1130 and P1150 are your two front oxygen sensors( pre cats ) bank one and two. Depending on your millage it sounds like it is time for a little maintence. Normally they should be changed at or around 60,000 kms
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Has it been run out of fuel recently ?
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