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.
1993 Lexus ES 300 AutomaticFACTORY OEM SERVICE PROCEDURE
Trouble Code Identification
TROUBLE CODE IDENTIFICATION (1)
| Code | Description | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12 | RPM Signal Circuit | |||||||||||
| 13 | RPM Signal Circuit | |||||||||||
| 14 | Ignition Signal Circuit | |||||||||||
| 16 | ECT Control Signal Malfunction | |||||||||||
| 21 | ||||||||||||
| ES300 & SC300 | Main Oxygen Sensor Circuit | |||||||||||
| GS300 (2) | Main Oxygen Sensor Circuit | |||||||||||
| 28 | ||||||||||||
| ES300 & SC300 | Main Oxygen Sensor Circuit | |||||||||||
| GS300 (2) | Main Oxygen Sensor Circuit | |||||||||||
| 22 | Coolant Temperature Sensor Signal Circuit | |||||||||||
| 24 | Intake Air Temperature Sensor Signal Circuit | |||||||||||
| 25 | ||||||||||||
| ES300 | Air/Fuel Ratio Malfunction | |||||||||||
| GS300 & SC300 | Air/Fuel Ratio Malfunction | |||||||||||
| 26 | ||||||||||||
| ES300 | Air/Fuel Ratio Malfunction | |||||||||||
| GS300 & SC300 | Air/Fuel Ratio Malfunction | |||||||||||
| 27 | ||||||||||||
| ES300 (2) | Sub-Oxygen Sensor Circuit | |||||||||||
| GS300 & SC300 (2) | Sub-Oxygen Sensor Circuit | |||||||||||
| 31 | ||||||||||||
| ES300 | Low Airflow Meter Voltage | |||||||||||
| GS300 & SC300 | Low Airflow Meter Voltage | |||||||||||
| 32 (3) | High Airflow Meter Voltage | |||||||||||
| 35 (4) | Barometric Pressure Sensor Circuit | |||||||||||
| 41 | ||||||||||||
| ES300 | Throttle Position Sensor (TPS) Circuit | |||||||||||
| GS300 & SC300 | Throttle Position Sensor (TPS) Signal | |||||||||||
| 42 | Vehicle Speed Sensor (VSS) Signal Circuit | |||||||||||
| 43 (5) | Starter Signal | |||||||||||
| 47 (4) | Throttle Position Sensor (TPS) Signal | |||||||||||
| 51 | ||||||||||||
| ES300 | Switch Condition Signal | |||||||||||
| GS300 & SC300 | Switch Condition Signal | |||||||||||
| 52 | Knock Sensor Signal | |||||||||||
| 53 | Knock Sensor Signal | |||||||||||
| 55 | Knock Sensor Signal | |||||||||||
| 71 | ||||||||||||
| ES300 (2) | EGR System Malfunction | |||||||||||
| GS300 & SC300 (2) | EGR System Malfunction | |||||||||||
| 78 (4) | Fuel Pump Control Circuit | |||||||||||
|
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Factory Service Tools
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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.
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