If you own a Toyota or work on a Toyota, knowing the different fault codes that the onboard diagnostic system of your car might throw can be very helpful. These fault codes tell you what might be wrong with your Toyota’s systems, making it easier to figure out what’s wrong and fix it. In this piece, we’ll tell you everything you need to know about Toyota fault codes, including how to sort them and what they mean.
An Overview of Toyota Error Codes
Modern Toyota cars have advanced onboard diagnostics (OBD) systems that keep an eye on different parts and systems. When the OBD system finds a problem, it makes a fault code, which is a unique set of letters and numbers that tells you what the problem is.
How to Look Up Toyota Error Codes
It’s easy to get Toyota fault codes. You can connect to your car’s OBD port with an OBD scanner or code reader. Once linked, the scanner will talk to the OBD system and get the fault codes, which can then be read using a diagnostic code chart.
Toyota Fault Codes list
Here are some of the most popular fault codes for Toyotas and what they mean:
| OBD1 Codes | |
|---|---|
| 1 | Normal Condition. |
| 2 | Air Flow Meter signal. |
| 3 | Ignition signal. |
| 4 | Engine Coolant Temperature Sensor signal. |
| 5 | Oxygen Sensor. |
| 6 | RPM signal (Crank Angle Pulse). |
| 7 | Throttle Position Sensor signal. |
| 8 | Intake Air Temperature Sensor signal. |
| 9 | Vehicle Speed Sensor signal. |
| 10 | Starter signal. |
| 11 | Switch signal. |
| 11 | ECU/ECM. |
| 12 | Knock Control Sensor signal. |
| 12 | RPM signal. |
| 13 | Knock Control CPU (ECM). |
| 13 | RPM signal. |
| 14 | Turbocharger Pressure. |
| 14 | Ignition signal. |
| 21 | Oxygen Sensor. |
| 22 | Engine Coolant Temperature Sensor signal. |
| 23 | Intake Air Temperature Sensor signal. |
| 24 | Intake Air Temperature Sensor signal. |
| 25 | Air-Fuel Ratio Lean. |
| 26 | Air-Fuel Ratio Rich. |
| 27 | Sub Oxygen Sensor signal. |
| 28 | No. 2 Oxygen Sensor signal. |
| 31 | Air Flow Meter signal (Vacuum Sensor signal). |
| 32 | Air Flow Meter signal. |
| 34 | Turbocharger Pressure signal. |
| 35 | Turbocharger Pressure Sensor signal. |
| 35 | HAC Sensor signal. |
| 41 | Throttle Position Sensor signal. |
| 42 | Vehicle Speed Sensor signal. |
| 43 | Starter signal. |
| 51 | Switch signal. |
| 52 | Knock Sensor signal. |
| 53 | Knock Sensor signal. |
| 54 | Inter-cooler ECM signal. |
| 71 | EGR System. |
| 72 | Fuel Cut Solenoid signal. |
| 78 | Fuel Pump Control signal. |
| 81 | TCM Communication. |
| 83 | TCM Communication. |
| 84 | TCM Communication. |
| 85 | TCM Communication. |