Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

The Reason for Code 4 on an Opel Astra J

Model: Vauxhall Astra Astra J - Years: 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
Part: Warning light – error code

See other generations:
Video tutorial

In this video, we explain the meaning of code 4 on the instrument cluster of an Opel Astra J: the coolant level is low, so you should add some. However, upon checking the coolant, it was found that the level was normal.

This suggests a problem with a sensor. This sensor is located inside the coolant reservoir, so it was necessary to replace the reservoir as well.

In fact, it is possible to obtain the two parts separately: on e-commerce sites, we found the reservoir on auto-doc.it with code 47905 for £26.16 plus £9.95 shipping. The sensor is available on eBay with code 124001337109 for £18.99 with free shipping.


Updated on 14 September 2026 by ScegliAuto


Related tutorials

What Does Error Code 35 Indicate on the Opel Astra?
What Does Error Code 35 Indicate on the Opel Astra?
Vauxhall Astra (2015-2022 / Astra K) The "error code 35" on Opel vehicles, particularly the Opel Astra, Meriva, and Insignia, corresponds to the airbag maintenance and control system. Wh…
How to Enter the Radio Code for the Opel Astra
How to Enter the Radio Code for the Opel Astra
Vauxhall Astra (1998-2006 / Astra G) In this brief guide, we will see the instructions that will allow us to enter the radio code for the Opel Astra, thus unlocking all radio stations. F…
What Does Error Code 82 Mean on the Opel Astra?
What Does Error Code 82 Mean on the Opel Astra?
Vauxhall Astra (2009-2016 / Astra J) Error code 82 indicates that the oil change interval level has been reached. This error code activates on all Opel vehicles. Today, we will specifica…

    Frequently Asked Questions

    • Astra 2015-2022 - What does code 82 mean on a Vauxhall Astra? Read answer
    • Astra 2015-2022 - What does error code 62 indicate on the Opel Astra K? Read answer
    • Astra 2009-2016 - What does fault code 54 mean on the Opel Astra version J? Read answer
    • Astra 2015-2022 - What does code 16 mean on the Opel Astra? Read answer
    • Astra 2009-2016 - What does the message "code 89" mean in the Opel Astra? Read answer
    • Astra 2004-2010 - What does error 68302 mean on the dashboard of the Opel Astra H? Read answer
    • Astra 2004-2010 - Where can I find the list of error codes for the Opel Astra? Read answer
    • Astra 2009-2016 - What does the Opel Astra J error code 60 mean? Read answer
    • Astra 2009-2016 - When does code 59 appear in the Opel Astra? Read answer
    • Astra 2015-2022 - What does the error code 22 mean on the Opel Astra? Read answer
    • Astra 2015-2022 - What does code 21 mean on the Opel Astra? Read answer
    • Astra 1998-2006 - What does the Code 22 of the Opel Astra mean? Read answer
    • Astra 2009-2016 - What does code error 84 mean on Opel Astra? Read answer
    • Astra 2015-2022 - What does code 95 mean in an Opel Astra? Read answer
    • Astra 2009-2016 - What does code 82 mean on an Opel Astra? Read answer
    • Astra 2009-2016 - What does code 89 of the Opel Astra J mean? Read answer
    • Astra 2009-2016 - What does the Opel Astra TC light mean? Read answer
    • Astra 2009-2016 - What does code 4 mean in the Opel Astra J? Read answer
    • Astra 2004-2010 - What does the Opel Astra error code ECN 050074 mean? Read answer
    • Astra 2009-2016 - What does the error code 82 mean on my Opel Astra j? Read answer

How to Remove the Rear Seat of a Hyundai Tucson?

To remove the rear seat of a Hyundai Tucson, follow these steps. Start by moving the front seats to their most forward position to gain space. Next, locate the release lever on the underside of the rear seat, near the floor. Press this lever down while pulling the seat upwards to unlock it from the anchor pins. Once unlocked, tilt the seat upwards and forwards to remove it from its position. Repeat this process for both sides of the rear seat. Be careful of any electrical cables or components that may be connected to the seat during removal. Once the rear seat is removed, the disassembly is complete.

Watch the video!


by ScegliAuto

More videos