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Opel Astra P0171 OBDII Trouble Code Diagnosis

One of the most common trouble codes with the Opel Astra is the P0171 code. This code number references a number that is given to you when you plug your car into a OBDII scanner. Its not the most complicated OBDII trouble code to diagnose. It is also one of the most common.

Astra P0171 Code Symptoms

The P0171 code on a Опель Astra will often be thrown if the fuel injection system is not operating properly. Typically the code will be triggered by a lean condition in the engine.

There arent usually any drivability issues associated with P0171. For most people the first sign that anything is wrong at all is the service engine soon light coming on.

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Here are the typical symptoms that something is wrong when you have code P0171.

  • Mileage- may or may not suffer depending on how much the air fuel mixture has changed.
  • Misfire If the air fuel mixture has gotten too far from factory specs, this can cause the Astra to misfire.
  • Idle Issues With the air/fuel mixture altered, the vehicle can idle erratically as the computer compensates to keep the engine running.
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This YouTube video is a great resource for diagnosing the P0171 trouble code in your Astra.

Astra P0171 Code Defined

P0171 is an OBDII trouble code. The code technically stands for:

The code is thrown when the oxygen sensors detect that theres not enough oxygen in the exhaust system. This is commonly referred to as a lean condition.

The vehicles ECM will add more fuel to the mixture in order to bring the air fuel mixture where it needs to be for optimal combustion. It also throws the code P0171 to let you know that it has done this.

Top Opel Astra P0171 Causes

There are many things that can cause the P0171 trouble code on the Opel Astra. Here are the most common ones.

  • Vacuum Leaks With the Opel Astra, one of the most common cause for the P0171 code to show is a vacuum leak. Take a look around and see if you can find the vacuum leak. Heres a great YouTube video on how to find a vacuum leak.
  • Oxygen Sensor The P0171 codes is thrown when the oxygen sensor(s) do not register enough oxygen in the exhaust. When the oxygen sensor is bad, it can cause a false reading and trigger the code. The computer will still adjust the air/fuel mixture to compensate. This will cause the Astra to run rich.
  • Mass Air Flow Sensor The mass air flow sensor calculates the volume of air entering the engine. If it has gone bad, the air fuel mixture will be off and the P0171 code will show.
  • Bad Fuel Injectors If you have one or more fuel injectors that have gone bad that can certainly cause the air/fuel mixture to go bad.
  • Fuel Pump/Fuel Filter Todays modern fuel injected motors need a lot of fuel pressure to atomize the gas properly. If the fuel pressure is not as high as it needs to be this atomization doesnt happen properly and the optimal air/fuel mixture isnt achieved.
  • Air Filter While its not the most common reason to throw the P0171 code, a clogged air filter certainly can cause the code to throw. And, since its so easy to check, why not look?
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Good luck figuring out what is wrong with your Astra. If there are any inaccuracies, or anything that you feel could improve the article, please feel free to comment or message. Thank you.

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По Науке 25. Замена клапанной крышки Opel Astra J или ошибка P0171

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Отпишусь о том, что сделал. Как и советовали, снял клапан адсорбера, попробовал продуть ртом, не продувался. Затем промыл очистителем впускного тракта, оттуда вытекла черная жижа, прозвонил, все работает. Установил, завел, ошибка ушла. Единственное, что по прежнему смущает, это шипящий звук при открытии бензобака, чего раньше не было. Может сам угольный фильтр засорился и его нужно прочистить? Но для этого надо снимать бензобак или же засоренный угольный фильтр на шипение влияния не оказывает?

Opel Astra J — бедная смесь, ошибка P0171. Что это такое и как убрать?

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