Toyota 4Runner Fault Codes
You can find common Toyota 4Runner fault codes on this page that when clicked take you to a detailed description.
You can also type in the fault code you are getting below to find a more detailed description.
Search Toyota 4Runner Codes
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Toyota 4Runner Recalls
When a car manufacturer detects a problem with a model they put out a recall notice and more often than not offer to fix the problem free of charge.
You can check to see if your Toyota 4Runner has any recall notices on our sister site AutoRecalls.co, sorted by model year.View Toyota 4Runner Recalls »
Common 4Runner Fault Codes
These are the most common 4Runner fault codes that people are searching for.
Evaporative Emission Control System Leak DetectedLearn More Fixes
Catalyst System Efficiency Below Threshold (Bank 1)Learn More Fixes
Evaporative Emission Control System Incorrect Purge flowLearn More Fixes
System Too Lean (Bank 1)Learn More Fixes
Random/Multiple Cylinder Misfire DetectedLearn More Fixes
System Gross Leak Evaporative EmissionLearn More Fixes
Catalyst System Efficiency Below Threshold (Bank 2)Learn More Fixes
Evaporative Emission Control System Vent Control Circuit MalfunctionLearn More Fixes
Evaporative Emissions System Small Leak DetectedLearn More Fixes
Vehicle Speed Sensor MalfunctionLearn More
Intake Camshaft Position Timing - Over-Advanced (Bank 1)Learn More Fixes
System Too Lean (Bank 2)Learn More Fixes
O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)Learn More
Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 1Learn More Fixes
O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)Learn More
Throttle Pedal Position Sensor/Switch A Circuit MalfunctionLearn More
Evaporative Emission Control System MalfunctionLearn More Fixes
Insufficient Coolant Temperature for Closed Loop Fuel ControlLearn More
Transmission Range Sensor Circuit Malfunction (PRNDL Input)Learn More Fixes
Cylinder 1 Misfire DetectedLearn More Fixes
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor ALearn More Fixes
Crankshaft Position Sensor A Circuit MalfunctionLearn More Fixes
ECM/PCM Processor FaultLearn More Fixes
Cylinder 6 Misfire DetectedLearn More Fixes
Shift Solenoid E MalfunctionLearn More
Shift Solenoid E ElectricalLearn More
Evaporative Emission Control System Leak DetectedLearn More
Igniter Circuit Malfunction - No. 1.Learn More
SBDS Interactive CodesLearn More
Air/Fuel Sensor Heater Circuit Response. (Bank 1 Sensor 1)Learn More
Code Word UnregesteredLearn More
Purge Flow Sensor Circuit High InputLearn More
ABS Inlet Valve Coil RR Circuit Short To BatteryLearn More
Lamp Brake Warning Output Circuit FailureLearn More Fixes
Accelerator Pedal Position Sensor Circuit.Learn More
System Too Rich (Bank 1)Learn More Fixes
Input/Turbine Speed Sensor Circuit No SignalLearn More
ABS Hydraulic Pressure Differential Switch Input Short Circuit To GroundLearn More
Cylinder 4 Misfire DetectedLearn More Fixes
Passenger Power Window Motor Circuit Short To GroundLearn More
Control Module PerformanceLearn More Fixes
Lamp Turn Signal Front Output Circuit Short To GroundLearn More
Wiper Rear High Limit Input Circuit FailureLearn More
Wiper Rear Motor Up Relay Coil Circuit Short To GroundLearn More
Lamp Backup Switch Input Circuit OpenLearn More
Lamp Turn Signal Front Output Circuit Short To BatteryLearn More
ABS Outlet Valve Coil RR Circuit Short To GroundLearn More
ABS Outlet Valve Coil RR Circuit FailureLearn More
ABS Inlet Valve Coil LF Circuit Short To GroundLearn More
Damper LR Circuit FailureLearn More
ABS Outlet Valve Coil Rear Circuit OpenLearn More
Torque Converter Clutch Circuit Performance or Stuck OffLearn More
Exhaust Camshaft Position Timing - Over-Retarded (Bank 1)Learn More
Transmission control module (TCM) – EEPROM malfunctionLearn More
Fuel System Leak Detected - Large LeakLearn More Fixes
Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 2Learn More
Camshaft Position Sensor Circuit MalfunctionLearn More Fixes
Yaw Rate Sensor Signal FaultLearn More
O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)Learn More
Lost Communication With Brake System Control ModuleLearn More
Lost Communication With ECM/PCM "A"Learn More Fixes
Lost Communication With Fuel Injector Control ModuleLearn More Fixes
High Speed CAN Communication BusLearn More Fixes
Lost Communication With Anti-Lock Brake System (ABS) Control ModuleLearn More
Lost Communication With ECM/PCM "B"Learn More
Control Module Communication Bus "A" OffLearn More Fixes
Lost Communication with Fuel Pump Control Module (FPCM)Learn More
Lost Communication With Body Control Module "B"Learn More
Lost Communication With Body Control ModuleLearn More
Secondary Air Injection System Relay A circuit MalfunctionLearn More
Knock Control CPU.Learn More
Air/Fuel Sensor Heater Circuit. (Bank 1 Sensor 2)Learn More
Throttle position (TP) sensor/mass air flow (MAF) sensor – implausible signalLearn More
Air/Fuel Sensor Circuit Range/Performance. (Bank 1 Sensor 2)Learn More
Heated oxygen sensors (H02S) 1 (upstream), bank 1Learn More
- Manufacturer: Toyota
About the 4Runner
The 4Runner first hit the American market in 1984. Since then, there have been five generations to be released. The latest of these made its debut in 2009. While originally being sold only in the US, it is now sold across most of both North and South America.
The model, like several other Toyota offerings, was given its name by Saatchi & Saatchi advertising company. It comes as a play on the word ‘forerunner’ and emotes the SUV’s 4×4 drivetrain.
The 4Runner has faced competition from a number of American offerings. The most notable of these include the Ford Bronco, Jeep Grand Cherokee, and its sibling, the Toyota Highlander.
It was placed fifth in a 2019 study for long-lasting vehicles in the US, owing to its great reliability. However, all cars have their own faults. Thankfully, the 4Runner’s are relatively mild in terms of severity.
The most commonly searched fault codes along with the model are P0441 and P0442. These are both related to the evaporative emission control (EVAP) system. The first is a purge flow problem and the second represents a leak being detected.
These are typically caused by faulty components in the EVAP system. The most likely culprit is a defective purge control valve, particularly for P0441. Another fairly common cause for both of these codes is simply a loose or defective fuel cap.
Neither of these codes presents a huge risk to the driveability of the vehicle or the health of its parts, but should still be checked out when possible.
A more serious issue that 4Runner owners have reported is fault code P0420, which represents a malfunction with the catalytic converter. This can lead to some fairly expensive replacements if not tackled quickly.
In some cases, this can be caused by exhaust leaks, but a faulty converter is one of the most likely causes.