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- TOYOTA DIAGNOSTIC CODES P0171 HOW TO
- TOYOTA DIAGNOSTIC CODES P0171 MANUAL
- TOYOTA DIAGNOSTIC CODES P0171 CODE
When the oxygen sensor is bad, it can cause a false reading and trigger the code. Oxygen Sensor– The P0171 codes is thrown when the oxygen sensor(s) do not register enough oxygen in the exhaust.
TOYOTA DIAGNOSTIC CODES P0171 HOW TO
Here’s a great YouTube video on how to find a vacuum leak. Take a look around and see if you can find the vacuum leak.
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TOYOTA DIAGNOSTIC CODES P0171 CODE
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Typically the code will be triggered by a lean condition in the engine. The P0171 code on a Toyota Previa will often be thrown if the fuel injection system is not operating properly. It also throws the code P0171 to let you know that it has done this. The vehicle’s ECM will add more fuel to the mixture in order to bring the air fuel mixture where it needs to be for optimal combustion. This is commonly referred to as a “lean” condition. The code is thrown when the oxygen sensors detect that there’s not enough oxygen in the exhaust system. P0171: Fuel Trim System Lean Bank 1 Previa P0171 Code Defined It’s not the most complicated OBDII trouble code to diagnose. This code number references a number that is given to you when you plug your car into a OBDII scanner. If that doesn't do it, it's probably time to enlist the help of a professional.One of the most common trouble codes with the Toyota Previa is the P0171 code.
TOYOTA DIAGNOSTIC CODES P0171 MANUAL
Consult your Toyota's manual for its exact location, which is specific to model.
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If cleaning the MAF sensor and inspecting the lines doesn't solve the problem, it may be time to replace the O2 sensor on bank 1. Additionally, be sure to check all of the connections and hoses on the air intake and check for intake manifold leaks.įinally, it's never a bad idea to change your air and fuel filter, especially if they're just about due for replacement anyways. When you clean the MAF sensor, be sure to inspect all of the lines including the vacuum and PCV hoses. Most of the time, the best way to respond to a P017 is to try cleaning the MAF sensor and the lines running to and from it. Of course, this code can also signify a bad O2 sensor in bank 1.Īdditionally, it's rare (but still possible) that a P0171 code can be tripped by a plugged fuel injector, by a dirty fuel filter causing low fuel pressure, or even an exhaust leak before the first O2 sensor€¦isn't engine trouble code diagnosis fun? Oftentimes, a P0171 means that your Toyota is having trouble with a dirty or faulty mass air flow (MAF) sensor, or a vacuum leak downstream of the MAF sensor (perhaps in the PCV line or in the valve itself).