I recently purchased a 957 Cayenne, it is a 2009 and I didn't like the look of the yellow halogen bulbs, so I started my way on doing a full LED conversion inside and out. It is worth mentioning that my cayenne comes equipped with the bi-xenon headlights with cornering lights. First I changed all the interior bulbs and had no issues, but when I changed the bulbs on the outside it started throwing out warnings The bulbs changed on the outside were the high beams, cornering lights, front and rear fog lights and the reverse lights. Also, the lights that were changed start flashing on and off after around a minute of being turned on. The warnings that it currently shows are for the highway lights, fog lights and reverse lights. I was wondering if anyone has had the same issue or has found a way to solve this. I couldn't find any threads relating the topic.

 

Load resistors.
Can get the inline type of resistors, ie https://auxito.com/products/dz-load-resistors-decoder (pick what base the bulb is) but they do add 'bulk', as in I have no idea if you'd get 2 or 3 sets in the rear tail light housings.
Can also get 'direct fit' LED's but these are still a bit of a hit and miss - thou I do have JW Speaker (I'd never heard of the brand till someone at a shop said they'd work) direct fit H11's in the cornering lights and do not have a bulb error.

 

Do both your reverse lights work? I remember trying to convert my 955 to LED reverse lights. As soon as I would plug both in they'd both go out. and I'd have no reverse lights at all.

 

Not sure about the others, but I've been dealing with the changing out the reverse lights on my 2010 Cayenne GTS as they are extremely dim. I tried just about every bulb on 1156/7506 LED bulb available on Amazon. Even tried adding resistors wiring to the bus bar inside the assembly. I ended up finding 1156 LEDs from deAutoLED.com, they are labeled as universal. After emailing them and them confirming adamantly they will work without causing the dreaded "Check Reversing Lights" message on the dash, I purchased a set of two for around $50. They showed up a couple days later, and thankfully they work, no errors, and are significantly brighter than the OE P21W incandescent bulbs.

https://deautokey.com/product/univer...all-car-models

 

I encountered the exact same issue yesterday on my 955. However when I put back the original bulbs I still have no reverse lights at all how did you fix your issue? I can’t seem to find any fuses or a reverse light switch on my transmission either?? How do they get the Signal?

thanks