Lexus OBD1 Trouble Codes
The following trouble codes are specific to Lexus. You may also see Toyota trouble codes, since Lexus and Toyota are of the same parent company.
Lexus Trouble Codes Access
Without OBD Scan Tool
- Locate the diagnostic connector (data port connector) under the hood, near the passenger side fender.
- Remove the protective identification cap and wipe away excess die-electric grease. Identify the TE1 and TE terminals which are shown under the cover
- Once the terminals have been identified, insert a jumper wire.
- Turn the ignition key to on position while observing the check engine light which will start to flash. The first set of blinks will be the first position of the numerical trouble code. Then a pause will occur, the next digit will start to flash. For example, if the check engine light flashes three times, and then pauses, then flashes five more times, the code number would be 35.
Lexus Trouble Codes Clearance
All trouble codes must be cleared from the ECU’s memory after repairing the faults. Otherwise, code(s) would remain in the ECU’s memory indefinitely and would appear along with a new code in the event of a future problem. To clear the trouble codes, proceed as follows:
- Turn the ignition key to position off.
- Disconnect the battery negative terminal for at least 20 seconds and the ECU (ECM) memory will be erased.
- Reconnect the battery negative terminal and check the codes to confirm the repair.
Warning: Disconnecting the battery may erase memory from electronic units, e.g., clock, radio.
Lexus Generic Trouble Codes
- Click the table header to sort the table data by the respective column heading.
- Type keyword(s) in the table’s search box for a quick display of the searched data.
| Code(s) | Description |
|---|---|
| 12 | RPM Signal |
| 13 | RPM Signal |
| 14 | Ignition Signal |
| 15 | Ignition Signal |
| 16 | Electronically Controlled Transmission Control Signal |
| 17 | CMP No. 1 |
| 18 | CMP No. 2 |
| 21 | Main Oxygen Sensor & Heater Signal |
| 22 | ECT Sensor Signal |
| 24 | IAT Sensor Signal |
| 25 | Air - Fuel Ratio Lean Malfunction |
| 26 | Air - Fuel Ratio Rich Malfunction |
| 27 | Sub Oxygen Sensor Signal |
| 28 | Main Oxygen Sensor |
| 29 | Sub Oxygen Sensor |
| 31 | Low Airflow Meter Voltage |
| 32 | High Airflow Meter Voltage |
| 35 | HAC/Barometric Pressure Sensor Signal |
| 41 | TP Sensor Signal |
| 42 | Vehicle Speed Sensor Signal |
| 43 | Starter Signal |
| 47 | Sub TP Sensor |
| 48 | Secondary Injection System Malfunction |
| 51 | Switch Condition Signal |
| 52 | KS Signal |
| 53 | Knock Control Signal |
| 55 | KS Signal |
| 70 | EGR System Malfunction |
| 71 | EGR System Malfunction |
| 78 | Fuel Pump Control |