Audi RS4 B8 TECH HELP PLEASE

[911gary]

Good Morning My RS4 B8 2013 intermittently shows multiple faults happens every few weeks,it has KW coilovers fitted,under deceleration and a bit of steering input it flashes "Steering fault","Sport differential fault" and "adaptive headlight failure" after two or three drive cycles it all goes back to normal all fault appear and disappear together any ideas please?

[somouk]

I would get an error code reader and see exactly what the faults are. Unfortunately things like this can either be a really simple thing or something really complex that only someone experienced in troubleshooting them will know.

Knowing the exact codes will be a big help though.

[Martyn76]

Is it still on it's original battery, I know my BMW is quite sensitive to a failing battery resulting in random warning messages.

[Adrian E]

It does need plugging in to VCDS or similar to establish what stored faults there are - a failing battery is indeed quite a common source of random electrical mischief, but that will also show up on a VCDS scan as it'll indicate the car's going into energy management to preserve enough power to start.

I'm probably a bit far from you (nr Gatwick) but there's bound to be someone local with VCDS, or just take it to a decent indy specialist.

Does the KW kit involve fitting an interface kit to replace or spoof signals from the original suspension? If so, given the nature of the reported warnings, that could very easily be a source too. If the person who fitted it didn't do a great job of waterproofing connections......

[Dr G]

I was going to say exactly what Adrian's already said, with battery being the most likely culprit followed by wiring.

[911gary]

Yes thank you it seems to me software or coding,its a specic dynamic that sets it off ,a little bit of lock slight incline moderate braking eitherway bing dash lights up,all codes retrieved are steering angle related,just want to resolve KW first to ensure any software/coding is correct.thanks so much

[911gary]

Dr G said:

I was going to say exactly what Adrian's already said, with battery being the most likely culprit followed by wiring.

[911gary]

Adrian E said:

It does need plugging in to VCDS or similar to establish what stored faults there are - a failing battery is indeed quite a common source of random electrical mischief, but that will also show up on a VCDS scan as it'll indicate the car's going into energy management to preserve enough power to start.

I'm probably a bit far from you (nr Gatwick) but there's bound to be someone local with VCDS, or just take it to a decent indy specialist.

Does the KW kit involve fitting an interface kit to replace or spoof signals from the original suspension? If so, given the nature of the reported warnings, that could very easily be a source too. If the person who fitted it didn't do a great job of waterproofing connections......