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.
Diagnostic Trouble Code Chart
HINT:
Parameters listed in the chart may be different than your readings depending on the type of instrument used and other factors.
During the DTC check, refer to the table below if a malfunction code is displayed.
| DTC | Description |
|---|---|
| DTC P0037 | : OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2) |
| DTC P0038 | OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 2) |
| DTC P0043 | OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 3) |
| DTC P0044 | OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 3) |
| DTC P0136 | OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2) |
| DTC P0137 | OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2) |
| DTC P0138 | OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2) |
| DTC P0142 | OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 3) |
| DTC P0143 | OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 3) |
| DTC P0144 | OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 3) |
| DTC P0420 | CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1) |
| DTC P0441 | EVAPORATIVE EMISSION CONTROL SYSTEM INCORRECT PURGE FLOW |
| DTC P0442 | EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (SMALL LEAK) |
| DTC P0446 | EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL CIRCUIT |
| DTC P0456 | EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (VERY SMALL LEAK) |
| DTC P2004 | INTAKE MANIFOLD RUNNER CONTROL STUCK OPEN (BANK 1) |
| DTC P2006 | INTAKE MANIFOLD RUNNER CONTROL STUCK CLOSED (BANK 1) |
| DTC P2009 | INTAKE MANIFOLD RUNNER CONTROL CIRCUIT LOW (BANK 1) |
| DTC P2010 | INTAKE MANIFOLD RUNNER CONTROL CIRCUIT HIGH (BANK 1) |
| DTC P2014 | INTAKE MANIFOLD RUNNER POSITION SENSOR/SWITCH CIRCUIT (BANK 1) |
| DTC P2016 | INTAKE MANIFOLD RUNNER POSITION SENSOR/SWITCH CIRCUIT LOW (BANK 1) |
| DTC P2017 | INTAKE MANIFOLD RUNNER POSITION SENSOR/SWITCH CIRCUIT HIGH (BANK 1) |
| DTC P2423 | TOYOTA-HCAC-SYSTEM (BANK 1) |
The following images display a list of all DTCs and their Trouble Area Identification identifiers.
NO RELATED
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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.