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.
2004 Toyota Avalon XLSFACTORY OEM SERVICE PROCEDURE
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.
DIAGNOSTIC TROUBLE CODE REFERENCE
| DTC | Description |
|---|---|
| P0010 | Camshaft Position "A" Actuator Circuit (Bank 1) |
| P0011 | Camshaft Position "A" - Timing Over - Advanced or System Performance (Bank 1) |
| P0012 | Camshaft Position "A" - Timing Over - Retarded (Bank 1) |
| P0016 | Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A) |
| P0018 | Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A) |
| P0020 | Camshaft Position "A" Actuator Circuit (Bank 2) |
| P0021 | Camshaft Position "A" - Timing Over - Advanced or System Performance (Bank 2) |
| P0022 | Camshaft Position "A" - Timing Over - Retarded (Bank 2) |
| P0036 | Oxygen Sensor Heater Control Circuit (Bank 1 Sensor 2) |
| P0100 | Mass or Volume Air Flow Circuit |
| P0101 | Mass or Volume Air Flow Circuit Range/Performance Problem |
| P0110 | Intake Air Temperature Circuit |
| P0115 | Engine Coolant Temperature Circuit |
| P0116 | Engine Coolant Temperature Circuit Range/ Performance Problem |
| P0120 | Throttle/Pedal position Sensor/Switch "A" Circuit |
| P0121 | Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem |
| P0125 | Insufficient Coolant Temperature for Closed Loop Fuel Control |
| P0128 | Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) |
| P0134 | Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1) |
| P0135 | A/F Sensor Heater Circuit (Bank 1 Sensor 1) |
| P0136 | Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2) |
| P0154 | Oxygen Sensor Circuit No Activity Detected (Bank 2 Sensor 1) |
| P0155 | A/F Sensor Heater Circuit (Bank 2 Sensor 1) |
| P0171 | System too Lean (Bank 1) |
| P0172 | System too Rich (Bank 1) |
| P0174 | System too Lean (Bank 2) |
| P0175 | System too Rich (Bank 2) |
| P0300 | Random/Multiple Cylinder Misfire Detected |
| P0301 | Cylinder 1 Misfire Detected |
| P0302 | Cylinder 2 Misfire Detected |
| P0303 | Cylinder 3 Misfire Detected |
| P0304 | Cylinder 4 Misfire Detected |
| P0305 | Cylinder 5 Misfire Detected |
| P0306 | Cylinder 6 Misfire Detected |
| P0325 | Knock Sensor 1 Circuit (Bank 1 or Single Sensor) |
| P0330 | Knock Sensor 2 Circuit (Bank 2) |
| P0335 | Crankshaft Position Sensor "A" Circuit |
| P0340 | Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor) |
| P0341 | Camshaft Position Sensor "A" Circuit Range/Performance (Bank 1 or Single Sensor) |
| P0345 | Camshaft Position Sensor "A" Circuit (Bank 2) |
| P0346 | Camshaft Position Sensor "A" Circuit Range/Performance (Bank 2) |
| P0351 | Ignition Coil "A" Primary/Secondary Circuit |
| P0352 | Ignition Coil "B" Primary/Secondary Circuit |
| P0353 | Ignition Coil "C" Primary/Secondary Circuit |
| P0354 | Ignition Coil "D" Primary/Secondary Circuit |
| P0355 | Ignition Coil "E" Primary/Secondary Circuit |
| P0356 | Ignition Coil "F" Primary/Secondary Circuit |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) |
| P0441 | Evaporative Emission Control System Incorrect Purge Flow |
| P0442 | Evaporative Emission Control System Leak Detected (Small Leak) |
| P0446 | Evaporative Emission Control System Vent Control Malfunction |
| P0450 | Evaporative Emission Control System Pressure Sensor/Switch |
| P0451 | Evaporative Emission Control System Pressure Sensor/Switch Range/Performance |
| P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) |
| P0500 | Vehicle Speed Sensor "A" |
| P0505 | Idle Air control System |
| P0511 | Idle Air Control Circuit |
| P0560 | System Voltage |
| P0705 | Transmission Range Sensor Circuit Malfunction (PRNDL Input) |
| P0724 | Brake Switch "B" Circuit High |
| P0850 | Park/Neutral Switch Input Circuit |
| P2195 | A/F Sensor Range/Performance Lean Side (Bank 1 Sensor 1) |
| P2196 | A/F Sensor Range/Performance Rich Side (Bank 1 Sensor 1) |
| P2197 | A/F Sensor Range/Performance Lean Side (Bank 2 Sensor 1) |
| P2198 | A/F Sensor Range/Performance Rich Side (Bank 2 Sensor 1) |
| P2237 | A/F Sensor Circuit (Bank 1 Sensor 1) |
| P2240 | A/F Sensor Circuit (Bank 2 Sensor 1) |
| P2A00 | A/F Sensor Circuit Slow Response (Bank 1 Sensor 1) |
| P2A03 | A/F Sensor Circuit Slow Response (Bank 2 Sensor 1) |
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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