What is the trouble code on my Toyota 4Runner?
One of the most common trouble codes with the Toyota 4Runner is the P0171 code. This code number references a number that is given to you when you plug your car into a OBDII scanner. It’s not the most complicated OBDII trouble code to diagnose. It is also one of the most common.
What does the code p0171 mean on a Toyota 4Runner?
4Runner P0171 Code Defined. P0171 is an OBDII trouble code. The code technically stands for: Fuel Trim System Lean Bank 1. The code is thrown when the oxygen sensors detect that there’s not enough oxygen in the exhaust system. This is commonly referred to as a “lean” condition.
Why does my 4Runner go into limp mode?
Below you will find comments from others that have had their 4Runners enter limp mode. These are all common reasons why your 4Runner might enter into limp mode and possibly how to fix the issue. Although these are a few of the most common, it doesn’t mean your exact problem is listed here.
What does the OBD mean on a Toyota 4Runner?
The OBD is what Toyota technicians connect their software (Tech Stream) in order to pull error codes from your computer (ECM – Electronic Control Module). In the graphic on the Toyota tech stream docs, you can see the OBD illustration is upside down when compared to the actual OBD in your 4Runner.
When does a Toyota engine have a trouble code?
This trouble code is usually triggered when the O2 sensor in position bank 1, sensor 1 is bad or has faulty wiring. Replacing the sensor will almost always get rid of the code.
What to do if your Toyota engine is not working?
Check the coolant first, then test the voltage of the sensor to narrow down is the problem is related to the sensor or the thermostat. This is a very common Toyota code. Try cleaning the throttle body and resetting the light, then waiting to see if it comes back before taking further action.
What does the code p0446 mean on a Toyota 4Runner?
P0446 is a universal OBDII trouble code. This means that regardless of which make or model of vehicle, the code will mean the same thing (4Runner or not). The code technically stands for: The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process.
How do you find the model code for a Toyota?
The following model codes have been used by Toyota. The letters of the model code is found by combining the letters of the engine code with the platform code. If the engine code and the platform code have two letters each, the middle letter is computed according to this formula: RN Platform ( 2R, 3R, 8R, 12R, 18R, 20R, 22R engine)
What causes a Toyota fuel system too lean Bank 1?
Air/vacuum leak. The second most common cause of a lean code on this vehicle is a faulty brake booster. The brake booster is vacuum assisted and works off of engine vacuum. If the brake booster goes bad and leaks engine vacuum, it will affect the fuel trims and the computer will flag this P0171 lean code.
What causes a lean code on a Toyota Corolla?
Even if it did go bad, I have not seen it flag a lean code. If you see a lean code on this year Corolla, it is usually caused by a faulty oxygen sensor in front of the converter or an air/vacuum leak. Note: Also, verify the evaporative purge solenoid is not stuck open or being grounded all the time by the Engine Control Module (ECM).