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Searched for Astra J Fault Code 21 - Astra J Fault Code 21 is related to the engine coolant temperature sensor. This fault code indicates that there is a problem with the sensor, which measures the temperature of the engine coolant.
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What does the CodE 35 code on the Opel Astra mean?
Answer: The fault code â € œCode 35â € which may appear on the Opel Astra instrument panel indicates a failure in the operation of the seat belt preten... read all

Posted on 11-06-2021

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What does the code "CodE 55" mean on the Opel Astra J series?
Answer: The fault code "CodE 55", which appears on the instrument cluster of the Opel Astra J-series, indicates a clogged particle filter. This fault causes t... read all

Posted on 13-12-2022

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What does code 18 mean on the Opel Astra?
Answer: Code 18 on the Opel Astra - but on all Opels in general - means that there is a fault with the left dipped beam lamp. It doesn't necessarily have to b... read all

Posted on 19-01-2023

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What does the Opel Astra J fault code 16 mean?
Answer: If when you turn on the instrument panel of your Opel Astra J (year 2009-2016) you notice the appearance of error code number 16, it means that there ... read all

Posted on 14-03-2023

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What does fault code 54 mean on the Opel Astra version J?
Answer: If error code 54 appears on the instrument cluster of the Opel Astra J version, it means that there is a fault with the internal electronic control mo... read all

Posted on 28-01-2023

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What does the error code 18 that appears on the Opel Astra J correspond to?
Vauxhall Astra (2009-2016 / Astra J) .. in English, the meanings of all possible error codes that may appear on your Opel Astra J. Opel adopts a code system instead of signaling with warning..
What does the error code "Code 35" mean in the instrument cluster of an Opel Astra?
Vauxhall Astra (2009-2016 / Astra J) .. When the "Code 35" error code is activated in the instrument panel of our Opel Astra, the car wants to inform us..
What does error code 35 indicate on the Opel Astra?
Vauxhall Astra (2015-2022 / Astra K) .. The "error code 35" on Opel vehicles, especially on the Opel Astra, Meriva, and Insignia models, corresponds to..
How to unlock the radio of an Opel Astra G version.
Vauxhall Astra (1998-2006 / Astra G) .. In this video, we see how to enter the security code in the Opel Astra G version car radio, after the battery has been disconnected, or after the radio..
The reason for code 4 on the Opel Astra J
Vauxhall Astra (2009-2016 / Astra J) .. In this video we see what the meaning of code 4 on the instrument panel of the Opel Astra J is: the coolant level is low, so we should add more...
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Video tutorial > Opel > Astra
Astra J Fault Code 21: Engine Coolant Temperature Sensor Issue: Astra J Fault Code 21 is related to the engine coolant temperature sensor. This fault code indicates that there is a problem with the sensor, which measures the temperature of the engine coolant. The sensor is responsible for sending this information to the engine control unit (ECU) so that it can make adjustments to the fuel mixture and ignition timing. If the sensor is faulty, it can lead to issues such as poor fuel economy, rough idling, and difficulty starting the engine. It is recommended to have the sensor checked and replaced if necessary to prevent further damage to the engine.

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