Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS1999RX 300 AWD V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTSERVICE PRECAUTIONSMAINTENANCE PRECAUTION
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)
Maintenance Precaution
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)SECTION Maintenance Precaution
1. BEFORE WORKING ON FUEL SYSTEM, DISCONNECT NEGATIVE (-) TERMINAL CABLE FROM BATTERY
HINT: Any diagnostic trouble code retained by the computer will be erased when the negative (-) terminal cable is removed from the battery. Therefore, if necessary, read the diagnosis before disconnecting the negative (-) terminal cable from the battery.
2. DO NOT SMOKE OR WORK NEAR AN OPEN FLAME WHEN WORKING ON FUEL SYSTEM
3. KEEP GASOLINE AWAY FROM RUBBER OR LEATHER PARTS
4. MAINTENANCE PRECAUTIONS
a. In event of the engine misfire, following the precautions should be taken.
1. Check proper connection of battery terminals, etc.
2. After repair work, check that the ignition coil terminals and all other ignition system lines are reconnected securely.
3. When cleaning the engine compartment, be especially careful to protect the electrical system from water.
b. Precautions when handling the oxygen sensor.
1. Do not allow oxygen sensor to drop or hit against an object.
2. Do not allow the sensor to come into contact with water.
HINT: Any diagnostic trouble code retained by the computer will be erased when the negative (-) terminal cable is removed from the battery. Therefore, if necessary, read the diagnosis before disconnecting the negative (-) terminal cable from the battery.
2. DO NOT SMOKE OR WORK NEAR AN OPEN FLAME WHEN WORKING ON FUEL SYSTEM
3. KEEP GASOLINE AWAY FROM RUBBER OR LEATHER PARTS
4. MAINTENANCE PRECAUTIONS
a. In event of the engine misfire, following the precautions should be taken.
1. Check proper connection of battery terminals, etc.
2. After repair work, check that the ignition coil terminals and all other ignition system lines are reconnected securely.
3. When cleaning the engine compartment, be especially careful to protect the electrical system from water.
b. Precautions when handling the oxygen sensor.
1. Do not allow oxygen sensor to drop or hit against an object.
2. Do not allow the sensor to come into contact with water.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.