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The Check Engine light stays on when emissions exceed federal standards. Jupiterimages/Creatas/Getty Images
Your Lexus on-board diagnostic (OBD 11) fault codes are a powerful diagnostic tool, but the codes are only one piece of information when your ES300 malfunctions. Lexus ES300 style and power requires service technicians, certified by the Lexus Commitment to Perfection program, at the Lexus dealership. The Lexus service technician will attach a scanner to your ES300 wiring system to read the fault codes and help diagnose the mechanical or electrical problem.
P0100 to P0399 Engine Fault Codes
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Owners of Lexus ES300s released in 1999 or 2000 report difficulty with oxygen sensors. From the Lexus forums, an 1999 ES300 owner reports P0150 and P0153 trouble codes, a problem with the bank 2, sensor 1 Oxygen sensor. Bank 2 is toward the front of the vehicle, and the oxygen sensor is near the exhaust manifold. Another 2000 Lexus ES300 owner reports the bank 1 sensor 1 Air/Fuel sensor is lit. This sensor is in the rear exhaust manifold. A list of ES300 OBD Engine Fault Codes follows:
P0100-P0104 Mass or Volume Air Flow
P0105-P0109 Exhaust Manifold
P0110-P0114 Intake Air Pressure
P0115-P0119 Engine Coolant Temperature
P0120-P0124 Throttle Position Sensor
P0125-P0126 Insufficient Coolant Temperature
P0128 Thermostat
P0130-P0167 Oxygen Sensors
P0168-P0194 Fuel Temperature Too High
P0195-P0199 Engine Oil
P0200-P0212 Fuel Injectors
P0213-P0214 Cold Start
P0218 Transmission Fluid Temperature
P0215 Engine Shut Off Solenoid
P0220-P0229 Gas Pedal
P0230-P0233 Fuel Pump
P0234-P0250 Turbo Chargers
P0251-P0260 Injection Pump
P0261-P0296 Engine Cylinders
P0298 Engine Oil Temperature Is Too High
P0300-P0314 Cylinder Misfire
P0320-P0323 Ignition
P0324-P0334 Knock Sensor
P0335-P0339 Crankshaft
P0385-P0389 Crankshaft
P0340-P0349 Camshaft
P0365-P0369 Camshaft
P0390-P0394 Camshaft
P0350-P0362 Ignition Coil
P0372-P0379 Timing
P0380-P0382 Heater Glow Plug
P0400 to P0699 Check Engine Fault Light
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The Check Engine Light may stay on, come and go or blink in response to the emissions system. If the problem does not recur, the light will go out. The OBD fault codes appear when the ES300's emissions rise above the emissions limit set by the federal government. Changing the type of fuel may solve the problem. A list of OBD 11 codes follows:
P0400-P0409 Exhaust Gas
P0410-P0419 Secondary Air
P0420-P0439 Catalyst System
P0440-P0457 Evaporative Emission
P0460-P0464 Fuel Level
P0465 Evaporative Purge
P0470-P0479 Exhaust Pressure
P0480-P0485 Cooling Fan
P0486-P0488 Exhaust Gas
P0491-P0492 Secondary Air Injection
P0500-P0509 Vehicle Speed
P0510 Closed Throttle
P0512 Starter
P0513-P0517 Battery Temperature
P0520-P0524 Engine Oil Sensor
P0530-P0534 Air Conditioner
P0540-P0542 Intake Air
P0544-P0549 Exhaust Gas
P0550-P0554 Power Steering
P0560-P0563 System Voltage
P0564-P0577 Cruise Control
P0600 Communications
P0601-P0610 Computer
P0615-P0617 Starter Relay
P0620-P0623 Generator
P0624 Fuel Cap
P0635-P0637 Power Steering
P0638-P0639 Throttle Actuator
P0640-P0647 Air Conditioner
P0649 Speed Control
P0654 Engine RPMs
P0660-P0665 Intake Valve Timing
Codes P0700 to P0999 Transmission System Faults
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An ES300 fault code from the transmission is an indication that the transmission malfunctioned. But the problem might originate elsewhere. If coolant is not the proper temperature, the transmission will be stuck in a lower gear. A list of transmission fault codes follows:
P0700-P0714 Transmission
P0720-P0723 Output Sensor
P0719,P0724 Torque Converter
P0725-P0728 Engine Speed
P0730-P0736 Generator
P0737-P0739 Engine Speed
P0749 Torque Converter Clutch
P0745-P0749 Pressure Control
P0750-P0779 Solenoid Switch
P0794-P0799 Specific Part of Transmission
P0800-P0835 Clutch & Transmission
P0836-P0839 Four Wheel Drive
P0840-P0849 ATF pressure
P0850-P0855 Park, Neutral, Drive
P0856-P0859 Traction
P0859-P0866 Transmission Control Unit
P0867-P0879 ATF Pressure
P0880-P0892 Transmission Relay
P0893-P0899 Transmission
P0900-P0999 Transmission and Clutch Actuator
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