Hello my name is Kieran I have a audi a6 avant estate 2007 reg is vn07aet I've got a strange issue with my rear left indicator cant get it to work replaced unit bulb holder and bulbs checked fuses with continuity test.

The front left and side signal still work rear left still doesn't come on if I engage the hazards please help its frying my brain 

Edited June 14, 2025Jun 14 by Kdew1993

Welcome Kieran and thanks for joining.

I take it you have a multimeter and have checked to ensure a good earth on that side, and presumable an absence of 12v -? 
If so, it would be well worth checking the wiring within the flexible harness section twixt body and tailgate. A favourite location for fractured cables. 
Regards,

Gareth.

To add to Gareth's advice, on older audi models if the hazard switch fails or starts to fail it can cause the I dictators to play up. If that's the case the cure is a new hazard switch 

The hazards switch doesn't seem to be playing up at all i had someone come out and test with a multi meter they proved that the light unit and bulb holder is fine it just isnt getting the power to it he suggested it might be the power moduler but I cant find which one it is 

Checked my advice then Keiran? 

I haven't got a tester at the moment unfortunately 

You don’t need a tester to inspect the condition of the cables within the flexible harness section Kieran.