86.5928SNJ

well I have 680 miles left to drive today to conclude my 3500 mile zig zag across the US. I parked at the hotel in South Bend yesterday evening after driving about 700 miles. I needed to move the car in the parking lot, turned the key and the ABS warning light came on. from reading other threads, I can tell you that the light came on after cranking the engine but not moving. this suggests the ABS relay, not the sensor. my question: online, I see ABS relays for $90-100. should I be using only Porsche relays that cost $100? or is it ok to use other relays that cost much less...if in fact there are other relays that can be purchased? thanks

Mrmerlin

a good used relay will also work fine

icsamerica

In a parking lot situation you usually turn the wheel to it's extremes so I'd check the ABS sensor wiring too. Over my 35 years of car ownership I've had many bad ABS sensors / wiring and zero ABS relay failures but who knows for sure. Just throwing it out there. Safe Travels. Being a City Slicker I never did much long distance driving but recent events forced some long distance travel with the family, not in a 928 unfortunately.

sendarius

I would be checking the wiring and connectors first, also.

In my "ABS light came on" scenario, it was caused by a harness dropping out of a retaining clip, and snagging on spinning parts in the wheel well.

I don't recall when the light would come on, at start-up or on first brake application, but it turned out to be an easy fix.
Annoying that I couldn't source the cable grommets to make it like original, though.

Koenig-Specials 928

When my ABS light came on It was Fuse #16 that had blown.

Mrmerlin

I have replaced 6 ABS relays on the CE panel, this cured the instant on ABS light.
Usually what blows this relay is shorting the ABS connection point to the fender while removing the screw,
or putting on a hi boost jumper to start a car with a dead battery

mj1pate

This user plus others have found instances where the harness fasteners break and the harness hangs in various places, getting banged up by rotating drive train components. Every time you change oil/fluids, slide up and down under the car and inspect all the ABS cables and fasteners

gbarron

Are you referring to P/N 92861240900? The grommet/clip that supports the harness in various places? If so, I was able to procure a dozen of them this year from the Porsche dealer.

F451

Does anyone know if there is a way to test the ABS relay on the CE panel? I'm in the ABS warning light club too. Just checked my wiring, it "appears" to be ok. Would love to test the ABS relay on the CE panel before I order up a new one. Thanks. -Ed

Christopher Zach

That's the clip that goes on the car that holds the grommet that holds the wire up and off the rear axle shafts. The problem I saw with my car was that the rubber grommets failed, leading to the wires falling, touching the axles, and the usual wear, short, and ABS failure. I had to pretty much replace all of them, and at $25 or so a grommet from Roger they are a bit expensive. But then again it's really really nice to have ABS so you don't rear-end another 928 on a rally...

Oddly enough my 944S also has one set of grommets gone on the back, but the brake sensor wire doesn't hang on the axle. Different design, just looks stupid right now.

sendarius

Yep - same, same here.

The car-side clips are fine, but the matching part that is on the harness itself is toast.

I suppose I could have sourced an entire new harness, but I have all the correct wire, plugs, and sheathing - so I made one.