ABS / ESP
ABS or ESP light on? We test the control unit.
With safety-relevant systems we test especially carefully – and clarify the cause and scope before we work on anything.
Typical symptoms
- ABS, ESP or brake warning light stays on
- “ESP inoperative” or “ABS inoperative” message
- Speedometer fails at the same time – on some vehicles the signal comes from the ABS
- No communication with the ABS control unit
- Fault appears after rain or on bumpy roads
What causes it?
The ABS/ESP control unit is usually attached directly to the hydraulic unit in the engine bay. Temperature changes and vibration stress the solder joints and connections on the board until contacts break intermittently or completely.
A faulty wheel speed sensor or a damaged cable can also trigger the warning light. So we first establish whether the control unit really is the cause.
Focus on Mercedes-Benz. AEZ is an independent master workshop; brand names are used for description only. We tell you whether a repair is possible after testing.
How the repair works.
- 1
Get in touch
Vehicle, VIN and what happened – via WhatsApp, phone or form.
- 2
Drop off or send in
Hand it in at Bottrop or, after a quick chat, send it by DHL. How shipping works
- 3
Test, price, repair
You get the findings and price before we repair. Then the unit goes back to you.
Frequently asked questions
Can I keep driving with the ABS light on?
The normal brakes usually keep working, but ABS and ESP do not. Drive carefully and have the fault checked soon.
How much does the repair cost?
That depends on the unit and the fault. After testing we tell you the price – we only repair with your approval.
Can I send the control unit in?
Yes. After a quick chat, by DHL to AEZ, Werkstraße 4, 46240 Bottrop, Germany. Packing tips and the shipping note to fill in are on the “Sending in a control unit” page.
Do you only work on Mercedes-Benz?
Our focus is Mercedes-Benz. For other makes, just ask with the vehicle and part number – we’ll tell you honestly whether we can help.