Toyota Diagnostic Trouble Codes
Common OBD2 fault codes found on Toyota vehicles with model-specific causes, known issues, TSBs, and adjusted repair cost estimates. Each guide is tailored for Toyota owners.
Electrical
"A" Camshaft Position Actuator Circuit (Bank 1)
Toyota Corolla • 2008-2024
Toyota's VVT-i system on the 1ZR-FE and 2ZR-FE engines is generally reliable, but the oil control va...
Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
Toyota Camry • 2007–2024
The 2GR-FE V6 (2007 to 2017 Camry) has knock sensors mounted in the valley between the cylinder bank...
Idle Air Control System Circuit Low
Toyota Camry • 1997-2006
Older Camrys with the 5S-FE and 1MZ-FE use a stepper-motor IAC valve. The coil windings can short in...
Idle Air Control System Circuit High
Toyota Camry • 1997-2006
Older Camrys with the 5S-FE and 1MZ-FE often log P0509 after IAC valve coil failure with an open win...
Emissions
"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
Toyota Camry • 2002-2024
The 2AZ-FE 2.4L engine (2002-2009) has well-documented VVT-i issues triggering P0011, typically from...
Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance
Toyota Yaris • 2005-2024
The 1.0L and 1.3L naturally aspirated engines rarely trigger MAP sensor codes, but when P0106 appear...
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
Toyota Corolla • 2005-2024
The 1ZR-FE and 2ZR-FE engines are reliable, but O2 sensors typically need replacement around 120,000...
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
Toyota Camry • 2007-2024
The upstream sensor on the Camry is mounted on the exhaust manifold and exposed to the highest tempe...
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
Toyota Camry • 2007-2024
The downstream O2 sensor on the Camry 2.5L (2AR-FE) is easily accessible from under the car. Toyota ...
Exhaust Gas Recirculation (EGR) Flow Insufficient
Toyota Camry • 2007-2024
The Camry's petrol EGR system is simple and reliable, so P0401 is uncommon before about 150,000 km. ...
Catalyst System Efficiency Below Threshold (Bank 1)
Toyota Camry • 2007-2024
The 2007-2011 Camry with the 2.4L 2AZ-FE engine is especially prone to P0420 because of a known cata...
Catalyst System Efficiency Below Threshold (Bank 2)
Toyota Camry • 2007-2024
P0430 on the Camry V6 (2GR-FE) usually means the Bank 2 converter has reached end of life at 150,000...
Ignition
Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
Toyota Camry • 2007-2024
The 2AR-FE 2.5L uses a timing chain with a hydraulic VVT-i system. P0016 on this engine is often cau...
Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
Toyota Camry • 2007-2018
Camry V6 with the 2GR-FE has knock sensors under the intake manifold, so any P0328 repair is labour-...
Camshaft Position Sensor Circuit Malfunction
Toyota Camry • 2007-2024
The Camry CMP sensor on the 2AR-FE four-cylinder sits on the cylinder head near the camshaft sprocke...
Fuel System
Mass Air Flow Sensor Range/Performance
Toyota Camry • 2007-2024
The Camry uses a Denso hot-wire MAF sensor. On the 2AR-FE 2.5L, the MAF is easily accessible at the ...
System Too Lean (Bank 1)
Toyota Camry • 2007-2024
The 2012-2017 Camry 2.5L (2AR-FE) commonly triggers P0171 from intake manifold gasket failures, espe...
System Too Rich (Bank 1)
Toyota Camry • 2007-2024
The 2AR-FE 2.5L in 2012-2017 Camrys can develop P0172 from a failing PCV valve that lets excess cran...
System Too Lean (Bank 2)
Toyota Camry • 2007-2024
P0174 only appears on the V6 Camry (2GR-FE), since the four-cylinder is single-bank and triggers P01...
Idle Air Control System RPM Lower Than Expected
Toyota Camry • 2002-2018
Older Camrys with the 2AZ-FE and 2GR-FE use an electronic throttle body that fouls with carbon over ...
Idle Control System RPM Higher Than Expected
Toyota Camry • 2007-2024
The Camry 2AR-FE uses an electronic throttle body without a separate IAC valve. P0507 is almost alwa...
Cooling System
Engine Coolant Temperature (ECT) Circuit
Toyota Corolla • 2005-2024
Toyota coolant temperature sensors are durable and P0115 is uncommon, but when it appears the connec...
Engine Coolant Temperature (ECT) Circuit Range / Performance
Toyota Corolla • 2005-2024
On the Corolla, P0116 most often traces to a thermostat that opens too early rather than a failed se...
Engine Coolant Temperature (ECT) Circuit Low
Toyota Corolla • 2005-2024
On the Corolla, P0117 most often comes from a shorted sensor or moisture-induced corrosion bridging ...
Engine Coolant Temperature (ECT) Circuit High
Toyota Corolla • 2005-2024
On the Corolla, P0118 most often traces to an open sensor or a loose connector. Check the plug is fu...
Coolant Thermostat Below Regulating Temperature
Toyota Camry • 2007-2024
The 2AR-FE 2.5L thermostat in 2012-2017 Camrys is accessible and straightforward to replace. Toyota ...
Misfire
Random/Multiple Cylinder Misfire Detected
Toyota Camry • 2007-2024
The 2.5L 2AR-FE in 2012 to 2017 Camrys is known for ignition coil failures that set P0300, and Toyot...
Cylinder 3 Misfire Detected
Toyota Yaris • 2006-2024
The 1.0-litre 1KR-FE and 1.5-litre 1NZ-FE engines are generally reliable, but spark plugs that excee...
Cylinder 6 Misfire Detected
Toyota Camry • 2007-2018
Camry V6 with the 2GR-FE typically logs P0306 from a worn cylinder 6 coil or a clogged injector. The...
EVAP System
Evaporative Emission System: Incorrect Purge Flow
Toyota Camry • 2007-2024
Toyota EVAP systems are reliable, so P0441 on a Camry usually points to the vacuum switching valve (...
Evaporative Emission System Leak Detected (Small Leak)
Toyota Yaris • 2006-2024
P0442 on the Yaris is most commonly caused by a worn fuel cap seal, as the cap is a simple screw-typ...
Evaporative Emission System Vent Control Circuit
Toyota Camry • 2007-2024
Toyota Camry EVAP vent valves are located near the charcoal canister at the rear of the vehicle. The...
Evaporative Emission System: Very Small Leak
Toyota Camry • 2007-2024
Toyota EVAP systems set P0456 most often from a loose or hardened fuel cap. The 2007-2017 Camry uses...
Evaporative Emission System: High Purge Flow
Toyota Camry • 2007-2024
Toyota EVAP systems are durable, so a P0496 on a Camry usually points at a vacuum switching valve (t...
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