Question about 1999 Lexus RX 300
What do I need to check and where is it located
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Posted on Jan 02, 2017
P1130 Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction (Bank 1 Sensor 1)
This sensor is the hardest to get at. It is between the cat and the cylinder block on the bank of cylinders closest to the firewall. Not much wiggle room back there.
Sensor will run you about $225 from Toyota, $275 from Lexus, but you may be able to get a Denso sensor on line.
Good luck and hope this helps. keep me posted.
Posted on Jun 26, 2009
This is a lenghty job!! You would have to remove the plastic engine cover to locate the plugs (cover that has the lexus symbol). There are 3 coils(black squarish units) on the front head and another three in the rear head. You must remove these to access the sprakplugs. Front is very easy!! The rear is difficult, you would have to remove the intake(special tools are needed) to access the rear coils and sparkplugs. hopefully this helps
Posted on Jul 24, 2009
coolant temp sensor is located on the bootom backside of the radiator. you will have to remove the front under cover to access it.
Posted on Oct 09, 2009
SOURCE: I have 3 codes 1) P0500
The PO125 is an indication of an engine running too cold-as if the thermostat were stuck open.For some reason it often sets with the PO1135 even when the engine runs at normal temp.A scan tool will indicate exactly how hot the engine is,don't trust the dash gauge. The PO1135 is a heater circuit fault in the bank1 sensor1 air fuel ratio sensor or oxygen sensor. Bank 1 is the REAR bank on this car...that O2 sensor is not much fun.PO500 is a vehicle speed sensor fault-does the speedo work correctly?it is located in the transmission near the back of the case. once again the scan tool will read vehicle speed and can aid in further diagnosis.
Posted on Mar 30, 2010
SOURCE: 1999 lexus rx300 check engine
Your 306 code means you have a misfire on cylender 6. That may be the cause of the po 125. Inspecdt the coil, spark plug wire, and spark plug on cylender 6. With the age of the car I would replace all 3 items. If you want know how to test all 3 I can tell you process of elimination is the way to do it. Do you know how to find cylender 6
Posted on Oct 15, 2010
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