Light left error but Bulp and fuse ok
Oct 1, 2026 at 11:10 AM
B121715?
2017 SKODA SUPERB
STEFAN KELLER
- MEMBER
- 2 POSTS
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Head Light front left not working even with bulb and fuse ok
Oct 1, 2026 at 5:12 PM
(Merged)
Ok that code indicates a problem in the low bean circuit specifically so
it one of 3 things
1..the ecu cut off the power to the circuit when the bulb or fuze blew and cast a code most time to ecu will restore it back to its factory setting only after erasing the code ..(most comon)
2 ..one of the 2 wore in the circuit cold be touching power somwhere or power could have e sounded out
3..the plug or wire is broken corrided disconnected...
My honest opinion is its door number 1 (most likly ) just erase the codes and see what happens let us know what you find
Good luck hope this helps
it one of 3 things
1..the ecu cut off the power to the circuit when the bulb or fuze blew and cast a code most time to ecu will restore it back to its factory setting only after erasing the code ..(most comon)
2 ..one of the 2 wore in the circuit cold be touching power somwhere or power could have e sounded out
3..the plug or wire is broken corrided disconnected...
My honest opinion is its door number 1 (most likly ) just erase the codes and see what happens let us know what you find
Good luck hope this helps
Oct 1, 2026 at 5:12 PM
(Merged)
B121715 indicates a left low-beam headlamp circuit fault—an open circuit or short to battery positive. It doesn’t necessarily mean the bulb is bad.
Oct 1, 2026 at 6:34 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.