Popular Opel/Vauxhall Astra fault codes along with an explanation of their meanings. Find out what you can do next to solve the problem you are experiencing.. Anyone know how to solve these codes popping up on the dash? Manual says its front sidelights. Front sidelights are operating as normal. The bulbs have 21/5W written on them. Not sure if they're the right ones or not.
10 year old Astra is displaying code 21 I have checked all the lights and they are working. If there any other reason for this?. Vauxhall, the British automaker with a rich heritage, has long been known for its reliable and stylish vehicles. But like any car, Vauxhalls can encounter issues that manifest as Diagnostic Trouble Codes (DTCs). Understanding these codes is crucial for car owners and technicians to ensure the smooth operation and maintenance of Vauxhall vehicles.