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The Reason for Code 4 on an Opel Astra J

Model: Vauxhall Astra Astra J - Years 2009-2016
Part: Warning light – error code

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

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    Frequently Asked Questions

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How to Check the Oil Level on a Jeep Renegade?

To check the oil level on a Jeep Renegade, you need to open the bonnet to access the components inside the engine bay: on the lower left side of the engine block, you will find the dipstick for checking the level. This should be pulled out and thoroughly cleaned with a cloth: once cleaned, reinsert it back into its tube and pull it out immediately after. This way, you can check that the oil mark is between the minimum and maximum levels; finally, you can place the dipstick back in its tube.

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