Alfa 147 Turn Signal Glitch Triggers Display Warnings

Had a similar issue on my Alfa 156 2005 gasoline. The turn indicator fault initially seemed like a simple bulb replacement, but turned out to be more complex. The electrical fault was traced to a damaged wiring harness connector near the steering column. The repair involved: Testing all indicator bulbs, Checking voltage at connection points, Replacing corroded wiring connector, Resoldering several loose connections, Clearing error codes from the system Root cause was water infiltration that corroded the main connector block. These electrical faults are common in this series and require thorough diagnosis. The automotive lighting system on these models uses specific connection points that can deteriorate over time. This wasnt a quick fix, required specialized diagnostic equipment to properly identify the failing components. If your speedometer display shows constant errors, its likely more than just a bulb issue. Would recommend having the entire signal circuit checked, including the multifunction switch and associated wiring. The indicator light system on these models is interconnected with other electrical components, so addressing it early prevents cascading issues with other systems.

Actually faced the same problem on my 147. Mine started with unusual signal lamp errors too, and yes, first tried simple bulb replacement which didnt solve it. The flasher relay ended up being the culprit, along with some corroded wiring that needed fixing. After replacing these parts, the indicator light system has worked flawlessly. Did you manage to get it sorted? Curious about the repair costs in your case and if any other electrical issues popped up since the fix. These Alfas can be tricky with their electronics.

Got it all sorted last week. Like your case, the broken lens wasnt the main problem, it was deeper in the electrical system. The mechanic found a faulty cable and plug connection affecting the turn indicator circuit. Total repair came to 95 Euro, which covered diagnosing and fixing the connection. The signal lamp now works perfectly with no more error messages on the display. No other electrical issues have surfaced since the repair. The bulb replacement checks I tried initially were a waste of time. These Alfa models really need proper electrical diagnosis when the indicator light system acts up. Glad I got it properly checked instead of continuing with basic troubleshooting. No other electrical problems have appeared since fixing that connection. The automotive lighting system is now working as it should. Worth every cent to have it properly diagnosed and repaired rather than just trying quick fixes.

After checking several mechanics, I finally found one who knew these models well. Took it in last Thursday and the diagnosis showed multiple issues with the automotive lighting system. The turn indicator problem stemmed from a corroded main relay and damaged wiring harness, similar to what others mentioned. They also found a failing connection in the steering column that was causing the error messages. Total repair cost was 280 Euro which included: New flasher relay unit, Wiring harness repair, Signal lamp connector replacement, System diagnostic reset The mechanic was thorough and showed me the damaged parts. No more error messages since the fix and all lights working perfectly. Should have gone straight to a specialist rather than wasting time with basic bulb replacements first. Just sharing my experience so others with similar issues know what to expect. These electrical gremlins need proper diagnosis to fix properly.