MOT advisory “Individual direction indicators slightly affected by the operation of another lamp” — meaning and what to do

This advisory means the tester found individual direction indicators that is slightly affected by the operation of another lamp — not bad enough to fail, but expected to need attention before your next MOT. It was recorded 4,575 times on UK certificates in 2025, making it one of the most common advisories in the country.
4,575Times recorded in 2025
Lamps, reflectors and electrical equipmentVehicle system
AdvisoryDoes not fail the test

What the tester saw

MOT testers work from the DVSA inspection manual. For this item the manual wording is “A direction indicator adversely affected by the operation of another lamp”. In plain English: there is wear or deterioration on the individual direction indicators that is currently within legal limits (defect category: Major). The tester is flagging it so you can plan the repair before it becomes a fail — or a roadside problem.

Do you need to fix it?

Not to stay legal today — an advisory does not affect the pass. But advisories are the tester telling you what will likely fail next time. Two sensible rules:

  • Safety-critical systems first. Lamps, reflectors and electrical equipment advisories are usually less urgent, but get a quote now so the cost doesn’t surprise you later.
  • Buying a used car? Repeated advisories for the same item across several years of MOT history mean the owner has been ignoring it. Check the car’s full record with our free MOT history check.

Typical repair cost

Bulbs are pence to a few pounds DIY; sealed LED units on modern cars can run £150+. Check the bulb type before paying garage labour on a 5-minute job.

DIY check before the garage visit

Rule out related electronic faults yourself — a scan takes two minutes and saves a diagnostic fee.

Related lamps, reflectors and electrical equipment advisories

Individual direction indicators slightly...490,271 recorded in 2025 Headlamp has a product on the lens but not...481,569 recorded in 2025 non-obligatory stop lamp not working178,357 recorded in 2025 Side repeaters slightly discoloured70,625 recorded in 2025 Headlamp has a product on the light source...41,796 recorded in 2025 All direction indicators slightly discoloured30,569 recorded in 2025

FAQs

Will “slightly affected by the operation of another lamp” fail my next MOT?

Not automatically — it fails only when the wear crosses the legal threshold in the inspection manual. But this advisory is the most common precursor: if left unattended, expect it to become a Minor or Major defect at a future test.

Can I ask the garage to remove an advisory?

No. Advisories are part of the official test record held by DVSA and appear in the vehicle’s public MOT history. Fixing the item means it simply won’t be advised next time.

Does an advisory affect the car’s value?

Slightly, yes — buyers who check MOT history (which is free) will price in the pending repair. Fixing cheap advisories before selling usually pays for itself.

Frequency: DVSA anonymised MOT data, 2025 (Class 4). Wording follows the DVSA inspection manual. Contains public sector information licensed under OGL v3.0.