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
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...
Camshaft Position Sensor Circuit Malfunction
Toyota Camry • 2007-2024
The CMP sensor on the Camry 2AR-FE is located on the cylinder head near the camshaft sprocket. It is...
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 engine in 2012-2017 Camrys can develop P0172 from a failing PCV valve that allows ex...
System Too Lean (Bank 2)
Toyota Camry • 2007-2024
P0174 on the Camry only appears on the V6 (2GR-FE) since the 4-cylinder is single-bank. On the V6, B...
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...
Emissions
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 O2 sensor on the Camry is mounted on the exhaust manifold and exposed to the highest te...
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 EGR system is relatively simple and reliable. P0401 is uncommon before 150,000 km. When ...
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 due to a known catalyti...
Catalyst System Efficiency Below Threshold (Bank 2)
Toyota Camry • 2007-2024
P0430 on the Camry V6 (2GR-FE) typically indicates the Bank 2 converter has reached end of life at 1...
Cooling System
Misfire
Random/Multiple Cylinder Misfire Detected
Toyota Camry • 2007–2024
The 2.5L 2AR-FE engine in 2012–2017 Camrys is known for ignition coil failures that trigger P0300. T...
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...
EVAP System
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...
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